• Like
  • Save
3.3 Mean, Median, Mode, Formulas
Upcoming SlideShare
Loading in...5
×
 

3.3 Mean, Median, Mode, Formulas

on

  • 95,187 views

Review of Mean, Median, and Mode, as well as the Rate Formula and Perimeter Formula.

Review of Mean, Median, and Mode, as well as the Rate Formula and Perimeter Formula.

Statistics

Views

Total Views
95,187
Views on SlideShare
95,021
Embed Views
166

Actions

Likes
7
Downloads
655
Comments
5

10 Embeds 166

http://www.slideshare.net 131
http://www.e-presentations.us 21
http://blendedschools.blackboard.com 4
http://ode.blackboard.com 2
http://lms.asknlearn.com 2
https://twitter.com 2
http://pinterest.com 1
http://mode-design.blogspot.com 1
https://davenport.blackboard.com 1
http://www.pinterest.com 1
More...

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

15 of 5 Post a comment

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    3.3 Mean, Median, Mode, Formulas 3.3 Mean, Median, Mode, Formulas Presentation Transcript

    • Remember the 3 Ms? Mean, Median, and Mode ~Central Tendency~ Section 3.3 September 30, 2008 By Ms. D-H
    • Mean?
      • Mean: the sum of the data items divided by the number of data items.
      • These are data items:
      • 2, 3, 4, 5, 8, 8, and 12
      • 2 + 3 + 4 + 5 + 8 + 8 + 12
      • 7 (total data items)
      • 42 / 7 = the mean, which is 6
    • Median?
      • Odd Number of Data Items : the middle number when the data items are put in numerical order.
      • Even Number of Data Items : the two middle numbers when data items are put in numerical order.
      • Median is the middle of the road
    • Median?
      • So find the median with these data items.
      • 2, 3, 4, 5, 8, 8, and 12
      • They’re in order
      • There are 7 numbers, meaning odd.
      • So which is the middle most number?
      • The median is 5.
    • Mode?
      • Mode: is the data item that occurs most often .
      • There can be one mode , multiple modes , or no mode . You can say how many modes there are too!
      • What about our previous data set?
      • 2, 3, 4, 5, 8, 8, and 12
      • 8 is a mode for these data items.
    • Find me the M, M & Ms
      • 12, 14, 26, 37, 8, and 14
      • Re-order: 8, 12, 14, 14, 26, 37.
      • Mean: 18.5
      • Median: 14
      • How many Modes: 1
      • Mode: 14
    • Find me the M, M & Ms
      • 2.3, 4.3, 3.2, 2.9, 2.7, and 2.3.
      • Re-order: 2.3, 2.3, 2.7, 2.9, 3.2, 4.3.
      • Mean: 2.95
      • Median: 2.8
      • How many Modes? 1
      • Mode: 2.3
    • Find me ONLY Mode:
      • Grape, grape, banana, nectarine, strawberry, strawberry, strawberry, orange, watermelon.
      • How many modes?
      • Just one: strawberry.
    • How many modes?
      • 11, 9, 7, 7, 8, 8, 13, 11
      • 3 Modes
      • 38.5, 55.4, 45.3, 38.5, 68.4
      • 1 Mode
    • Outlier
      • Outlier: is a data item (data value) that is much higher or lower than the other data values.
      • Outliers can affect the mean of a group of data.
      • Example: 2, 3.5, 1, 2.5, 5 billion.
      • Example: 35, 45, 40, 37, -6.
    • Describing Data with M, M, & M.
      • You can use what you know about Mean, Median, and Mode to describe data.
      • But figuring out which M describes it best is difficult.
      I think mode describes it best! Nah! Its got to be mean!
    • Which M, M, & M is best?
      • The favorite movie of students in the eighth grade class?
      • Mode: good for non-numerical data items and for frequent occurrences.
    • Which M, M, & M is best?
      • The distances students in your class travel to school.
      • Median: one student may live much further than everyone else. When an outlier may significantly influence the mean, we use median.
    • Which M, M, & M is best?
      • The daily high temperature during a week in July.
      • Mean: since daily temp. are not likely to have outlier, mean is best. When data have no outlier, use mean.
    • Measures and Central Tendency
      • Your text book is going to ask you determine which MEASURE of CENTRAL TENDENCY best describe the data.
      • Its just asking you to figure out which M works with the data best!
    • Using Formulas Section 3.4 Just two formulas.
    • Substituting into Formulas
      • Formula is an equation that shows a relationship between quantities that are represented by variables.
      • Like: Susie has b books. b is the number of books Susie has. b stands for something.
    • Rate
      • Distance = rate • (time)
      • d = rt
      • Cause remember? r and t next to each other means you multiply them.
      • So…rate multiplied by time = distance.
    • Obvious Example: d = r • t
      • Suppose Ms. Dewey-Hoffman traveled 162 miles in 2 hours. Use the formula.
      • How fast was I going? What was my rate?
      • d = r • t
      • d = distance, or 162 miles.
      • t = time, or 2 hours.
      • 162 miles = r • 2 hours.
    • Obvious Example: d = r • t
      • Suppose Ms. Dewey-Hoffman traveled 162 miles in 2 hours. Use the formula.
      • What was my rate?
      • 162 miles = r • 2 hours .
      • 2 hours 2 hours
      • 162  2 = 82 miles/hour
      • So, Ms. Dewey-Hoffman was traveling at 82 miles/hour to go 162 miles in 2 hours. 82 mph is my r or rate. =]
    • Try These: d = r • t
      • d = 200 yards, t = 24 seconds
      • What don’t we know? Set up equation. Solve.
      • r = 30 feet/minute, t = 5 minutes
      • What don’t we know? Set up equation. Solve.
    • Perimeter Formula: P = 2 l + 2 w .
      • Perimeter = 2(length) + 2(width).
      W W L L
      • The formula simplifies how the perimeter of a rectangle works.
      • Perimeter = l + l + w + w …so…
      • Perimeter = 2 l + 2 w
    • Try These: Tell Me Perimeter
      • Remember: P = 2l + 2w
      • Length = 16.8cm, Width = 27.3cm
      • Length = 8.6cm, Width = 17.4cm
      W L
    • Assignment #16
      • Pages: 134-135: # 5-8 All, 15-18 All.
      • Pages: 139-140: # 5–21 Odd.
      • Make sure you answer ALL parts of each problem, the first set of problems ask for a lot.