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The steps in computing the median are similar to that of Q1 and Q3
. In finding the median,
we need first to determine the median class. The Q1 class is the class interval where
the 𝑁
4
th score is contained, while the class interval that contains the 3𝑁
4
𝑡ℎ
score is the Q3 class.
Formula :𝑄𝑘 = LB +
𝑘𝑁
4
−𝑐𝑓𝑏
𝑓𝑄𝑘
𝑖
LB = lower boundary of the of the 𝑄𝑘 class
N = total frequency
𝑐𝑓𝑏= cumulative frequency of the class before the 𝑄𝑘 class
𝑓𝑄𝑘
= frequency of the 𝑄𝑘 class
i = size of the class interval
k = the value of quartile being asked
The interquartile range describes the middle 50% of values when
ordered from lowest to highest. To find the interquartile range (IQR),
first find the median (middle value) of the upper and the lower half of
the data. These values are Q1 and Q3
. The IQR is the difference
between Q3 and Q1
.
Interquartile Range (IQR) = Q3 – Q1
The quartile deviation or semi-interquartile range is one-half the
difference between the third and the first quartile.
Quartile Deviation (QD) =
𝑄3−𝑄1
2
The formula in finding the kth decile of a distribution is
𝐷𝑘 = 𝑙𝑏𝑑𝑘 +
(
𝑘
10)𝑁 − 𝑐𝑓
𝑓𝐷𝑘
𝑖
𝐿𝐵𝑑𝑘 − 𝐿𝑜𝑤𝑒𝑟 𝐵𝑜𝑢𝑛𝑑𝑎𝑟𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝑁 − 𝑡𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑖𝑒𝑠
𝑐𝑓 − 𝑐𝑢𝑚𝑚𝑢𝑙𝑎𝑡𝑖𝑣𝑒 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑏𝑒𝑓𝑜𝑟𝑒 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝐹𝑑𝑘 − 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝑖 − 𝑐𝑙𝑎𝑠𝑠 𝑠𝑖𝑧𝑒
This PPT tells you how to tackle with questions based on Average in CAT 2009. Ample of PPTs of this type on every topic of CAT 2009 are available on www.tcyonline.com
This material is for PGPSE / CSE students of AFTERSCHOOOL. PGPSE / CSE are free online programme - open for all - free for all - to promote entrepreneurship and social entrepreneurship PGPSE is for those who want to transform the world. It is different from MBA, BBA, CFA, CA,CS,ICWA and other traditional programmes. It is based on self certification and based on self learning and guidance by mentors. It is for those who want to be entrepreneurs and social changers. Let us work together. Our basic idea is that KNOWLEDGE IS FREE & AND SHARE IT WITH THE WORLD
IIT JAM MATH 2018 Question Paper | Sourav Sir's ClassesSOURAV DAS
IIT JAM Math Previous Year Question Paper
IIT JAM Math 2018 Question Paper
IIT JAM Preparation Strategy
For full solutions contact us.
Call - 9836793076
The steps in computing the median are similar to that of Q1 and Q3
. In finding the median,
we need first to determine the median class. The Q1 class is the class interval where
the 𝑁
4
th score is contained, while the class interval that contains the 3𝑁
4
𝑡ℎ
score is the Q3 class.
Formula :𝑄𝑘 = LB +
𝑘𝑁
4
−𝑐𝑓𝑏
𝑓𝑄𝑘
𝑖
LB = lower boundary of the of the 𝑄𝑘 class
N = total frequency
𝑐𝑓𝑏= cumulative frequency of the class before the 𝑄𝑘 class
𝑓𝑄𝑘
= frequency of the 𝑄𝑘 class
i = size of the class interval
k = the value of quartile being asked
The interquartile range describes the middle 50% of values when
ordered from lowest to highest. To find the interquartile range (IQR),
first find the median (middle value) of the upper and the lower half of
the data. These values are Q1 and Q3
. The IQR is the difference
between Q3 and Q1
.
Interquartile Range (IQR) = Q3 – Q1
The quartile deviation or semi-interquartile range is one-half the
difference between the third and the first quartile.
Quartile Deviation (QD) =
𝑄3−𝑄1
2
The formula in finding the kth decile of a distribution is
𝐷𝑘 = 𝑙𝑏𝑑𝑘 +
(
𝑘
10)𝑁 − 𝑐𝑓
𝑓𝐷𝑘
𝑖
𝐿𝐵𝑑𝑘 − 𝐿𝑜𝑤𝑒𝑟 𝐵𝑜𝑢𝑛𝑑𝑎𝑟𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝑁 − 𝑡𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑖𝑒𝑠
𝑐𝑓 − 𝑐𝑢𝑚𝑚𝑢𝑙𝑎𝑡𝑖𝑣𝑒 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑏𝑒𝑓𝑜𝑟𝑒 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝐹𝑑𝑘 − 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑘𝑡ℎ 𝑑𝑒𝑐𝑖𝑙𝑒
𝑖 − 𝑐𝑙𝑎𝑠𝑠 𝑠𝑖𝑧𝑒
This PPT tells you how to tackle with questions based on Average in CAT 2009. Ample of PPTs of this type on every topic of CAT 2009 are available on www.tcyonline.com
This material is for PGPSE / CSE students of AFTERSCHOOOL. PGPSE / CSE are free online programme - open for all - free for all - to promote entrepreneurship and social entrepreneurship PGPSE is for those who want to transform the world. It is different from MBA, BBA, CFA, CA,CS,ICWA and other traditional programmes. It is based on self certification and based on self learning and guidance by mentors. It is for those who want to be entrepreneurs and social changers. Let us work together. Our basic idea is that KNOWLEDGE IS FREE & AND SHARE IT WITH THE WORLD
IIT JAM MATH 2018 Question Paper | Sourav Sir's ClassesSOURAV DAS
IIT JAM Math Previous Year Question Paper
IIT JAM Math 2018 Question Paper
IIT JAM Preparation Strategy
For full solutions contact us.
Call - 9836793076
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3. Short-Cuts
Average of first n natural no. = n+1/2
Average of square of first n natural no. = (n+1)(2n+1)/6
Average of first n odd no. = n
Average of first n even no. = n+1
Average of consecutive no. = (first term + last term)/2
4. I Formula
Numbers Sum Average
(Sum/n)
First n numbers n(n+1)/2 (n+1)/2
First n odd numbers n^2 n
First n even numbers n(n+1) (n+1)
First n square
numbers
n(n+1)(2n+1)/6 (n+1)(2n+1)/6
Consecutive numbers n(first term + last term)/2 (first term + last term)/2
6. Find the average of following number:
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21
A. 9
B. 11
C. 12
D. 13
Question
7. Average of Consecutive Numbers = Middle Number
Given numbers
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21
are 11 consecutive odd numbers.
So Average is middle no
i.e. 6th number
And 6th Number is 11.
Solution
8. The average of 20 numbers is zero. Of them, at the
most, how many may be greater than zero?
A. 0
B. 1
C. 10
D. 19
Question
9. Answer: Option D
Explanation:
Average of 20 numbers = 0.
Sum of 20 numbers (0 x 20) = 0.
It is quite possible that 19 of these numbers may be
positive and if their sum is a then 20th number is (-a).
Solution
10. The average weight of 8 person's increases by 2.5 kg
when a new person comes in place of one of them
weighing 65 kg. What might be the weight of the new
person?
A. 76 kg
B. 76.5 kg
C. 85 kg
D. Data inadequate
E. None of these
Question
11. Answer: Option C
Explanation:
Total weight increased = (8 x 2.5) kg = 20 kg.
Weight of new person = (65 + 20) kg = 85 kg.
Or
Factor = Difference / Total
2.5 = Difference / 8
Difference = 20 Kg since word increase was mentioned in
statement so weight of new person= 65+20 =85
Solution
12. A library has an average of 510 visitors on Sundays and
240 on other days. The average number of visitors per
day in a month of 30 days beginning with a Sunday is:
A. 250
B. 276
C. 280
D. 285
Question
13. Answer: Option D
Explanation:
Since the month begins with a Sunday, so there
will be five Sundays in the month.(i.e on
1,8,15,22,29)
Required average =
(510 x 5 + 240 x 25) / 30
= 8550 / 30 = 285
Solution
14. A pupil's marks were wrongly entered as 83
instead of 63. Due to that the average marks for
the class got increased by half (1/2). The
number of pupils in the class is:
A. 10
B. 20
C. 40
D. 73
Question
15. Answer: Option C
Explanation:
Let there be x pupils in the class.
I Total increase in marks = 83 – 63 = 20
II Total increase in marks are x * ½
So, x * ½ = 20 and x = 40.
Or
Factor=Difference / Total
½=20/ T
Solution
16. The captain of a cricket team of 11 members is 26 years
old and the wicket keeper is 3 years older. If the ages of
these two are excluded, the average age of the
remaining players is one year less than the average age
of the whole team. What is the average age of the
team?
A. 23 years
B. 24 years
C. 25 years
D. None of these
Practice
17. Answer: Option A
Explanation:
Let the average age of the whole team by x years.
11x - (26 + 29) = 9(x -1)
11x - 9x = 46
2x = 46
x = 23.
So, average age of the team is 23 years.
Solution
18. In the first 10 overs of a cricket game, the run
rate was only 3.2. What should be the run rate
in the remaining 40 overs to reach the target of
282 runs?
A. 6.25
B. 6.5
C. 6.75
D. 7
Practice
22. Example: There are 36 students in class A whose average is 30kg and 24 students
in class B whose average is 40kg. What will be the average if the classes are
combined?
General equation
Avg36= 30, Avg24 = 40
Total weight of class A = 30 x 36
Total weight of class B = 40 x 24
Overall average = (Total weight of class A) + (Total weight of class B) / Number of
students in class A + Number of students in class B
= (30 x 36) + (40 x 24) / 36 + 24
= 34
23. BALANCE METHOD:
The principle of this concept is that the weight in
the balance is inversely proportional to the distance of the pivot.
Where,
Wa – Class A weight Wb – Class B weight
Avga – Class A average Avgb – Class B average
Avgc – combined average
Wa Wb
Avga Avgb
Avgc
24. There are 36 students in class A whose average is 30kg and 24 students in
class B whose average is 40kg. What will be the average if the classes are
combined?
Step 1: Find the ratio of the weights of A and B
= 36:24
= 3:2
Step 2: Inverse the weights to get the distance ratio
= 2:3
36
36
24
24
3:2
3:2
2:3
30
40
30
40
25. Step 3: Split the distance between the averages in the ratio 2:3
Here the distance from 30 to 40 is 10. So 10 should be split in the ratio 2:3
as 4 and 6.
The combined average is (30+4) or (40-6) = 34
30
36
40
24
3:2
2:3
34
4 6
26. . In class A there are 63 students whose average is 32,
and in class B there are 21 students whose average is 44
, then find the overall average?
A)33
B)35
C)36
D)38
27. Example: Average of 5 students marks is 30. If one student having 90 mark is added to the
team then what will be the new average ?
3.i General equation
Avg5 = 30
No of students = 5
Sum5 = 30x5
= 150
Sum6 = 150+90
= 240
Avg6 = 240/6
= 40
Or F=D/T
F=60/6=10 so new average=10+ 30=40
28. . Average of 4 students marks is 50 and one student
having marks has 200, is added to the team , what is new
average ?
A)70
B)80
C)90
D)None
29. Example 8. Average of 6 students marks is 60 , what is
the new average if a student of marks 110 is taken out ?
A50
B)55
C)60
D)None
30. .A batsman having average 40 makes 90 runs in his last
inning thereby his average increases by 2. Find the
number of matches he has played.
A)10
B)50
C)25
D)24
31. The average weight of 8 men having average weight 40
kg is increased by 2 kg when a new man is included.
The weight of the new man is
A) 56
B) 58
C) 96
D) 98