The Common Core State Standards for Mathematics outline essential practices for developing mathematical proficiency among students at all levels. These practices encompass problem-solving, abstract reasoning, argument construction, mathematical modeling, strategic tool usage, precision, structure recognition, and recognizing regularity in reasoning. They emphasize the importance of understanding mathematical concepts, operations, and relationships as foundational to successfully engaging with mathematics.

1. COMMON CORE STATE STANDARDS FOR MATHEMATICS
Standards for Mathematical Practice
The Standards for Mathematical Practice describe varieties of
expertise that mathematics educators at all levels should
seek to develop in their students. These practices rest on
important “processes and proficiencies” with longstanding
importance in mathematics education. The first of these are the
NCTM process standards of problem solving,
reasoning and proof, communication, representation, and
connections. The second are the strands of mathematical
proficiency specified in the National Research Council’s report
Adding It Up: adaptive reasoning , strategic
competence, conceptual understanding (comprehension of
mathematical concepts, operations and relations),
procedural fluency (skill in carrying out procedures flexibly,
accurately, efficiently and appropriately) and productive
disposition (habitual inclination to see mathematics as sensible,
useful, and worthwhile, coupled with a belief in
diligence and one’s own efficacy).
1 Make sense of problems and persevere in solving them.
Mathematically proficient students:
• explain to themselves the meaning of a problem and looking
for entry points to its solution.
• analyze givens, constraints, relationships, and goals.
• make conjectures about the form and meaning of the solution
attempt.

2. • consider analogous problems, and try special cases and
simpler forms of the original problem.
• monitor and evaluate their progress and change course if
necessary.
• transform algebraic expressions or change the viewing window
on their graphing calculator to get information.
• explain correspondences between equations, verbal
descriptions, tables, and graphs.
• draw diagrams of important features and relationships, graph
data, and search for regularity or trends.
• use concrete objects or pictures to help conceptualize and
solve a problem.
• check their answers to problems using a different method.
• ask themselves, “Does this make sense?”
• understand the approaches of others to solving complex
problems.
2. Reason abstractly and quantitatively.
Mathematically proficient students:
• make sense of quantities and their relationships in problem
situations.
ontextualize (abstract a given situation and represent it
symbolically and manipulate the representing
symbols as if they have a life of their own, without necessarily
attending to their referents and
ation
process in order to probe into the referents for the
symbols involved).
• use quantitative reasoning that entails creating a coherent
representation of quantities, not just how to compute
them
• know and flexibly use different properties of operations and

3. objects.
3 Construct viable arguments and critique the reasoning of
others.
Mathematically proficient students:
• understand and use stated assumptions, definitions, and
previously established results in constructing
arguments.
• make conjectures and build a logical progression of statements
to explore the truth of their conjectures.
• analyze situations by breaking them into cases
• recognize and use counterexamples.
• justify their conclusions, communicate them to others, and
respond to the arguments of others.
• reason inductively about data, making plausible arguments
that take into account the context
• compare the effectiveness of plausible arguments
• distinguish correct logic or reasoning from that which is
flawed
drawings, diagrams, and actions..
argument applies.
• listen or read the arguments of others, decide whether they
make sense, and ask useful questions
4 Model with mathematics.
Mathematically proficient students:
• apply the mathematics they know to solve problems arising in

4. everyday life, society, and the workplace.
addition equation to describe a situation. In middle
grades, a student might apply proportional reasoning to plan a
school event or analyze a problem in the
community.
design problem or use a function to describe how
one quantity of interest depends on another.
• simplify a complicated situation, realizing that these may need
revision later.
• identify important quantities in a practical situation
• map their relationships using such tools as diagrams, two-way
tables, graphs, flowcharts and formulas.
• analyze those relationships mathematically to draw
conclusions.
• interpret their mathematical results in the context of the
situation.
• reflect on whether the results make sense, possibly improving
the model if it has not served its purpose.
5 Use appropriate tools strategically.
Mathematically proficient students
• consider available tools when solving a mathematical problem.
• are familiar with tools appropriate for their grade or course to
make sound decisions about when each of these
tools
• detect possible errors by using estimations and other
mathematical knowledge.
• know that technology can enable them to visualize the results
of varying assumptions, and explore

5. consequences.
• identify relevant mathematical resources and use them to pose
or solve problems.
• use technological tools to explore and deepen their
understanding of concepts.
6 Attend to precision.
Mathematically proficient students:
• try to communicate precisely to others.
• use clear definitions in discussion with others and in their
own reasoning.
• state the meaning of the symbols they choose, including using
the equal sign consistently and appropriately.
• specify units of measure and label axes to clarify the
correspondence with quantities in a problem.
• calculate accurately and efficiently, express numerical
answers with a degree of precision appropriate for the
context.
lly formulated
explanations to each other.
make explicit use of definitions.
7 Look for and make use of structure.
Mathematically proficient students:
• look closely to discern a pattern or structure.
the same amount as seven and three more.
-remembered 7
x 5 + 7 x 3, in preparation for the distributive
property.
expression x2 + 9x + 14, older students can see the 14

6. as 2 x 7 and the 9 as 2 + 7.
• step back for an overview and can shift perspective.
• see complicated things, such as some algebraic expressions, as
single objects or composed of several objects.
8 Look for and express regularity in repeated reasoning.
Mathematically proficient students:
• notice if calculations are repeated
• look both for general methods and for shortcuts.
• maintain oversight of the process, while attending to the
details.
• continually evaluate the reasonableness of intermediate
results.
12/28/17, 8(39 AMStandards for Mathematical Practice |
Common Core State Standards Initiative
Page 1 of 6http://www.corestandards.org/Math/Practice/
Standards for Mathematical Practice
PRINT THIS PAGE
The Standards for Mathematical Practice describe varieties of
expertise that mathematics
educators at all levels should seek to develop in their students.
These practices rest on important
“processes and proficiencies” with longstanding importance in

7. mathematics education. The first
of these are the NCTM process standards of problem solving,
reasoning and proof,
communication, representation, and connections. The second are
the strands of mathematical
proficiency specified in the National Research Council’s report
Adding It Up: adaptive reasoning,
strategic competence, conceptual understanding (comprehension
of mathematical concepts,
operations and relations), procedural fluency (skill in carrying
out procedures flexibly, accurately,
efficiently and appropriately), and productive disposition
(habitual inclination to see
mathematics as sensible, useful, and worthwhile, coupled with a
belief in diligence and one’s own
efficacy).
Standards in this domain:
CCSS.MATH.PRACTICE.MP1 CCSS.MATH.PRACTICE.MP2
CCSS.MATH.PRACTICE.MP3
CCSS.MATH.PRACTICE.MP4 CCSS.MATH.PRACTICE.MP5
CCSS.MATH.PRACTICE.MP6
CCSS.MATH.PRACTICE.MP7 CCSS.MATH.PRACTICE.MP8
CCSS.MATH.PRACTICE.MP1

8. (HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP1/) Make sense of
problems and persevere in solving them.
Mathematically proficient students start by explaining to
themselves the meaning of a problem
and looking for entry points to its solution. They analyze
givens, constraints, relationships, and
goals. They make conjectures about the form and meaning of
the solution and plan a solution
pathway rather than simply jumping into a solution attempt.
They consider analogous problems,
and try special cases and simpler forms of the original problem
in order to gain insight into its
solution. They monitor and evaluate their progress and change
course if necessary. Older
javascript:%20window.print();
http://www.corestandards.org/Math/Practice/MP1/
12/28/17, 8(39 AMStandards for Mathematical Practice |
Common Core State Standards Initiative
Page 2 of 6http://www.corestandards.org/Math/Practice/
students might, depending on the context of the problem,
transform algebraic expressions or
change the viewing window on their graphing calculator to get

9. the information they need.
Mathematically proficient students can explain correspondences
between equations, verbal
descriptions, tables, and graphs or draw diagrams of important
features and relationships, graph
data, and search for regularity or trends. Younger students
might rely on using concrete objects
or pictures to help conceptualize and solve a problem.
Mathematically proficient students check
their answers to problems using a different method, and they
continually ask themselves, "Does
this make sense?" They can understand the approaches of others
to solving complex problems
and identify correspondences between different approaches.
CCSS.MATH.PRACTICE.MP2
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP2/) Reason abstractly and
quantitatively.
Mathematically proficient students make sense of quantities and
their relationships in problem
situations. They bring two complementary abilities to bear on
problems involving quantitative
relationships: the ability to decontextualize—to abstract a given
situation and represent it

10. symbolically and manipulate the representing symbols as if they
have a life of their own, without
necessarily attending to their referents—and the ability to
contextualize, to pause as needed
during the manipulation process in order to probe into the
referents for the symbols involved.
Quantitative reasoning entails habits of creating a coherent
representation of the problem at
hand; considering the units involved; attending to the meaning
of quantities, not just how to
compute them; and knowing and flexibly using different
properties of operations and objects.
CCSS.MATH.PRACTICE.MP3
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP3/) Construct viable
arguments and critique the reasoning of others.
Mathematically proficient students understand and use stated
assumptions, definitions, and
previously established results in constructing arguments. They
make conjectures and build a
logical progression of statements to explore the truth of their
conjectures. They are able to
analyze situations by breaking them into cases, and can
recognize and use counterexamples.

11. They justify their conclusions, communicate them to others, and
respond to the arguments of
others. They reason inductively about data, making plausible
arguments that take into account
the context from which the data arose. Mathematically
proficient students are also able to
compare the effectiveness of two plausible arguments,
distinguish correct logic or reasoning
from that which is flawed, and—if there is a flaw in an
argument—explain what it is. Elementary
http://www.corestandards.org/Math/Practice/MP2/
http://www.corestandards.org/Math/Practice/MP3/
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Common Core State Standards Initiative
Page 3 of 6http://www.corestandards.org/Math/Practice/
students can construct arguments using concrete referents such
as objects, drawings, diagrams,
and actions. Such arguments can make sense and be correct,
even though they are not
generalized or made formal until later grades. Later, students
learn to determine domains to
which an argument applies. Students at all grades can listen or
read the arguments of others,

12. decide whether they make sense, and ask useful questions to
clarify or improve the arguments.
CCSS.MATH.PRACTICE.MP4
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP4/) Model with
mathematics.
Mathematically proficient students can apply the mathematics
they know to solve problems
arising in everyday life, society, and the workplace. In early
grades, this might be as simple as
writing an addition equation to describe a situation. In middle
grades, a student might apply
proportional reasoning to plan a school event or analyze a
problem in the community. By high
school, a student might use geometry to solve a design problem
or use a function to describe
how one quantity of interest depends on another.
Mathematically proficient students who can
apply what they know are comfortable making assumptions and
approximations to simplify a
complicated situation, realizing that these may need revision
later. They are able to identify
important quantities in a practical situation and map their
relationships using such tools as

13. diagrams, two-way tables, graphs, flowcharts and formulas.
They can analyze those relationships
mathematically to draw conclusions. They routinely interpret
their mathematical results in the
context of the situation and reflect on whether the results make
sense, possibly improving the
model if it has not served its purpose.
CCSS.MATH.PRACTICE.MP5
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP5/) Use appropriate tools
strategically.
Mathematically proficient students consider the available tools
when solving a mathematical
problem. These tools might include pencil and paper, concrete
models, a ruler, a protractor, a
calculator, a spreadsheet, a computer algebra system, a
statistical package, or dynamic geometry
software. Proficient students are sufficiently familiar with tools
appropriate for their grade or
course to make sound decisions about when each of these tools
might be helpful, recognizing
both the insight to be gained and their limitations. For example,
mathematically proficient high

14. school students analyze graphs of functions and solutions
generated using a graphing calculator.
They detect possible errors by strategically using estimation and
other mathematical knowledge.
When making mathematical models, they know that technology
can enable them to visualize the
http://www.corestandards.org/Math/Practice/MP4/
http://www.corestandards.or g/Math/Practice/MP5/
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Page 4 of 6http://www.corestandards.org/Math/Practice/
results of varying assumptions, explore consequences, and
compare predictions with data.
Mathematically proficient students at various grade levels are
able to identify relevant external
mathematical resources, such as digital content located on a
website, and use them to pose or
solve problems. They are able to use technological tools to
explore and deepen their
understanding of concepts.
CCSS.MATH.PRACTICE.MP6
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP6/) Attend to precision.

15. Mathematically proficient students try to communicate precisely
to others. They try to use clear
definitions in discussion with others and in their own reasoning.
They state the meaning of the
symbols they choose, including using the equal sign
consistently and appropriately. They are
careful about specifying units of measure, and labeling axes to
clarify the correspondence with
quantities in a problem. They calculate accurately and
efficiently, express numerical answers with
a degree of precision appropriate for the problem context. In the
elementary grades, students
give carefully formulated explanations to each other. By the
time they reach high school they
have learned to examine claims and make explicit use of
definitions.
CCSS.MATH.PRACTICE.MP7
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP7/) Look for and make use
of structure.
Mathematically proficient students look closely to discern a
pattern or structure. Young
students, for example, might notice that three and seven more is
the same amount as seven and

16. three more, or they may sort a collection of shapes according to
how many sides the shapes have.
Later, students will see 7 × 8 equals the well remembered 7 × 5
+ 7 × 3, in preparation for
learning about the distributive property. In the expression x +
9x + 14, older students can see
the 14 as 2 × 7 and the 9 as 2 + 7. They recognize the
significance of an existing line in a
geometric figure and can use the strategy of drawing an
auxiliary line for solving problems. They
also can step back for an overview and shift perspective. They
can see complicated things, such
as some algebraic expressions, as single objects or as being
composed of several objects. For
example, they can see 5 - 3(x - y) as 5 minus a positive number
times a square and use that to
realize that its value cannot be more than 5 for any real numbers
x and y.
CCSS.MATH.PRACTICE.MP8
(HTTP://WWW.CORESTANDARDS.ORG/MATH/PRACTICE/
MP8/) Look for and express
regularity in repeated reasoning.
2
2

17. http://www.corestandards.org/Math/Practice/MP6/
http://www.corestandards.org/Math/Practice/MP7/
http://www.corestandards.org/Math/Practice/MP8/
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Common Core State Standards Initiative
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Mathematically proficient students notice if calculations are
repeated, and look both for general
methods and for shortcuts. Upper elementary students might
notice when dividing 25 by 11 that
they are repeating the same calculations over and over again,
and conclude they have a repeating
decimal. By paying attention to the calculation of slope as they
repeatedly check whether points
are on the line through (1, 2) with slope 3, middle school
students might abstract the equation (y
- 2)/(x - 1) = 3. Noticing the regularity in the way terms cancel
when expanding (x - 1)(x + 1), (x - 1)
(x + x + 1), and (x - 1)(x + x2 + x + 1) might lead them to the
general formula for the sum of a
geometric series. As they work to solve a problem,
mathematically proficient students maintain
oversight of the process, while attending to the details. They

18. continually evaluate the
reasonableness of their intermediate results.
Connecting the Standards for Mathematical Practice to the
Standards
for Mathematical Content
The Standards for Mathematical Practice describe ways in
which developing student
practitioners of the discipline of mathematics increasingly ought
to engage with the subject
matter as they grow in mathematical maturity and expertise
throughout the elementary, middle
and high school years. Designers of curricula, assessments, and
professional development should
all attend to the need to connect the mathematical practices to
mathematical content in
mathematics instruction.
The Standards for Mathematical Content are a balanced
combination of procedure and
understanding. Expectations that begin with the word
"understand" are often especially good
opportunities to connect the practices to the content. Students
who lack understanding of a
topic may rely on procedures too heavily. Without a flexible
base from which to work, they may

19. be less likely to consider analogous problems, represent
problems coherently, justify conclusions,
apply the mathematics to practical situations, use technology
mindfully to work with the
mathematics, explain the mathematics accurately to other
students, step back for an overview, or
deviate from a known procedure to find a shortcut. In short, a
lack of understanding effectively
prevents a student from engaging in the mathematical practices.
In this respect, those content standards which set an expectation
of understanding are potential
"points of intersection" between the Standards for Mathematical
Content and the Standards for
Mathematical Practice. These points of intersection are intended
to be weighted toward central
2 3
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Page 6 of 6http://www.corestandards.org/Math/Practice/
and generative concepts in the school mathematics curriculum
that most merit the time,

20. resources, innovative energies, and focus necessary to
qualitatively improve the curriculum,
instruction, assessment, professional development, and student
achievement in mathematics.
ems&tl'Project,'2012''''''''*'All'indicators'are'not'necessary'for'pr
oviding'full'evidence'of'practice(s).''Each'practice'may'not'be'evi
dent'during'every'lesson.''
Engaging&in&the&Mathematical&Practices&(Look5fors)&
Mathematics&Practices' Students:' Teachers:'
1. Make&sense&of&
problems&and&
persevere&in&
solving&them&
Understand'the'meaning'of'the'problem'and'look'for'entry'points'
to'its'solution'
Monitor'and'evaluate'the'progress'and'change'course'as'necessar
y'
and'ask,'“Does'this'make'sense?”'
'
Comments:'

21. them'to'persevere'in'order'to'reach'a'solution''
multiple'solutions''
urage'students'to'represent'their'thinking'while'problem'
solving''
'
Comments:'
O
v
e
ra
rc
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in
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h
a
b
it
s&
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f&
m
in
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&o
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a
&

22. p
ro
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u
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iv
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&m
a
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&t
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in
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6. Attend&to&
precision&
State'the'meaning'of'symbols,'carefully'specifying'units'of'meas
ure,'
and'providing'accurate'labels''
Calculate'accurately'and'efficiently,'expressing'numerical'answe
rs'
with'a'degree'of'precision'
'accurately'when'measuring'and'graphing'
'

23. Comments:'
encouraging'students'to'focus'on'clarity'of'the'definitions,'
notation,'and'vocabulary'used'to'convey'their'reasoning''
Encourage'accuracy'and'efficiency'in'computation'and'problemO
based'solutions,'expressing'numerical'answers,'data,'and/or'
measurements'with'a'degree'of'precision'appropriate'for'the'
context'of'the'problem''
'
Comments:'
2. Reason&
abstractly&and&
quantitatively&
Make'sense'of'quantities'and'relationships'in'problem'situations'
meaning'of'quantities'
se'properties'of'operations'
'
Comments:'

24. representations'to'make'sense'of'quantities'and'their'
relationships''
Encourage'the'flexible'use'of'properties'of'operations,'objects,'
and'solution'strategies'when'solving'problems''
a'situation)'and/or'contextualize'(identify'referents'for'symbols'
involved)'the'mathematics'they'are'learning''
'
Comments:'
R
e
a
so
n
in
g&
a
n
d
&E
xp
la
in
in
g&
3. Construct&viable&

25. arguments&and&
critique&the&
reasoning&of&
others&
Use'definitions'and'previously'established'causes/effects'(results
)'
in'constructing'arguments'
progression'of'statements'to'explore'and'support'ideas'
Communicate'and'defend'mathematical'reasoning'using'objects,'
drawings,'diagrams,'and/or'actions'
'probing'
questions'to'clarify'or'improve'the'arguments'
'
Comments:'
the'solution'strategies'of'others,'discuss'alternative'solutions,'
and'defend'their'ideas'
Ask'higherOorder'questions'which'encourage'students'to'defend'
their'ideas''

26. about'the'mathematics'they'are'learning''
'
Comments:'
'
Mathematics&Practices' Students:' Teacher(s):'
4. Model&with&
mathematics&
such'tools'as'diagrams,'twoOway'tables,'graphs,'flowcharts,'and/
or'
formulas'
Use'assumptions'and'approximations'to'make'a'problem'simpler'
situation'and'change'a'model'when'necessary'
'
Comments:'
Use'mathematical'models'appropriate'for'the'focus'of'the'lesson''
d'contentO

27. appropriate'mathematical'models'(e.g.,'variables,'equations,'
coordinate'grids)''
Remind'students'that'a'mathematical'model'used'to'represent'a'
problem’s'solution'is'‘a'work'in'progress,’'and'may'be'revised'as'
needed''
'
Comments:'
M
o
d
e
li
n
g&
a
n
d
&U
si
n
g&
T
o
o
ls
&
5. Use&appropriate&
tools&

28. strategically&
Make'sound'decisions'about'the'use'of'specific'tools'(Examples'
might'include:''calculator,'concrete'models,'digital'technologies,'
pencil/paper,'ruler,'compass,'protractor)'
Use'technological'tools'to'visualize'the'results'of'assumptions,'
explore'consequences,'and'compare'predications'with'data'
website)'and'use'them'to'pose'or'solve'problems'
Use'technological'tools'to'explore'and'deepen'understanding'of'
concepts'
'
Comments:'
explore'and'deepen'student'understanding''
specific'tools'appropriate'for'the'grade'level'and'content'focus'
of'the'lesson''
based'resources'that'assist'students'in'making'conjectures'
necessary'for'solving'problems''
'

29. Comments:'
7. Look&for&and&
make&use&of&
structure&
Look'for'patterns'or'structure,'recognizing'that'quantities'can'be'
represented'in'different'ways'
patterns'or'structure'for'solving'related'problems'
View'complicated'quantities'both'as'single'objects'or'compositio
ns'
of'several'objects'and'use'operations'to'make'sense'of'problems'
'
Comments:'
between'particular'topics'within'a'content'domain'or'across'
content'domains''
operations'and'their'properties'remain'important'regardless'of'
the'operational'focus'of'a'lesson''
Provide'activities'in'which'students'demonstrate' their'flexibility'
in'representing'mathematics'in'a'number'of'ways''

30. e.g.,''76'='(7'x'10)'+'6;'discussing'types'of'quadrilaterals,'etc.''
'
Comments:'
Se
e
in
g&
st
ru
ct
u
re
&a
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&g
e
n
e
ra
li
zi
n
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8. Look&for&and&
express&
regularity&in&
repeated&
reasoning&
shortcuts'

31. Continually'evaluate'the'reasonableness'of'intermediate'results'
(comparing'estimates),'while'attending'to'details,'and'make'
generalizations'based'on'findings'
'
Comments:'
that'may'occur'in'a'problem’s'solution''
when'solving'a'problem''
e'reasonableness'of'
their'results''
'
Comments:'
'
Grocery Task the Question Needed to Be Addressed and Point
Distribution for
Each Question:
FIRST PART for the SUBMISSION (I have completed the first
part, please help with
second part. please read my response below and might need
revision please feel

32. free to revise)
You all did this but if you want you can revise your prior work
in the ilearn. I will
grade the final version that include part 1 and part 2.
Please make sure you have given detailed response to the
questions 2 and 3 for the
first part. Thus, I advise revise your first part. Then, move in
the second part.
1. Have you face this situation before? How? (5pts)
2. What is your mathematical suggestion to make the decision?
Explain why it is
mathematically meaningful. What information do you need? (15
pts)
3. Which variables may effect the line speed? Explain how?
(10pts)
SECOND PART for the SUBMISSION
1. What grade levels/courses do you recommend presenting this
problem? Why?
Please refer to Common Core Math Standards document
available on the
ilearn under course materials section. (10pts)
2. Which of the standards for Mathematical Practices can be
addressed through
using this grocery task? Explain how? (10 pts)
a. What does this practice look like when students are engaging
with this
task? (Consider your grade level selection) (10pts)

33. b. What could a teacher do within a lesson to encourage
students in this
practice while engaging with this practice? (10pts) [Consider
mathematical knowledge for teaching]
3. What mathematical content knowledge required for this task
as a teacher?
(10 pts)
4. What does students need to know as a prior knowledge to
engage in this
task? (10 pts)
5. What do you hope for your students to learn mathematically
as a result of
engaging this task? (10 pts) [Think about mathematical
concepts, ideas,
representations etc.]
My answer to first part:
First, this is a common issue that happens in my daily life.
Second, the mathematical
strategy I am going to analyze this problem is called equal
probability. However, there
is some other information that needs to be clarified. Such as,
does these two lines have
equally efficient servers? And how long does it take each
customer to pay and leave?
In this question, Server efficiency and customer efficiencies are
the main factors or the
key to analyzing this problem.
If the servers and customers are equally efficient, the critical

34. quantity here is the number of
total items in the shopping line, not the number of customers.
For example, let the server
efficiency be X second/each item. Let the customer efficiency
be Y second/each transaction
!
(assume customer pay and leave right away). The first line will
need at least 11x+4y seconds
to complete four transactions. The other queue will need at least
19x+1y seconds to complete
one transaction. And to solve the equations lets x= 1sec/item,
y=2sec/transaction.
1) the first queue: 11(1)+4(2)=19secs
The first queue needs at least 19 seconds to complete all
transactions.
2) the second queue: 19(1)+1(2)=21secs
The second queue needs at least 21 seconds to complete all
transactions. 11x+4y<19x+1y
I will be joining the shopping line has four customers and with
three, five, two, and one
item in four shopping carts.
In conclusion, servers efficiency and shoppers efficiency are
essential information that
will directly affect our decision. And, do the two queues have
the same situations? However,
it can be different answers in different cases. If the server and
customer efficiency are the
same, the numbers of total items will be your number one
consideration. If not or the situation
even complicated, like different customer pay in various
methods, go to the shorter line.