“Don’t be so MEAN!”
Words spoken by an AVERAGE
man.
Average
• A number that typifies a set of numbers of which it is a function.
Huh?
Mean
• The average value of a set of numbers.
Huh?
Average=Mean
• The average is the mean.
• The mean is the average.Huh?
Let’s try it this way.• The average (or mean) of data is computed by
– 1. Adding all the data together (sum).– 2. Dividing that sum by the number of data.
Rocks Collected
Andrew 5 rocks 5
Shequeta 10 rocks 10
Karen 2 rocks 2
Byron 7 rocks + 7
5 + 10 + 2 + 7 = 24
24 ÷ 4 = 6So the average number of rocks collected was 6.
Here’s another example.The Aqua Club
Feona 3 fish 3
Lynda 2 fish 2
Chris 10 fish 10
Peter 6 fish 6
Cherelle 4 fish + 4
3 + 2 + 10 + 6 + 4 =25
25 ÷ 5 = 5
So the average number of fish owned by members of the Aqua club was 5.
You can find the average of your test grades.
Sam’s Spelling Grades
Jan. 9 90 % 90
Jan. 16 85 % 85
Jan. 25 82 % 82
Feb. 1 100 % 100
Feb. 8 100 % 100
Feb. 15 88 % + 86
90 + 85 + 82 + 100 + 100 + 86 = 543
543 ÷ 6 = 90.5So the average of Sam’s spelling grades is 90.5 which is rounded up to 91 which is an A.
Find the average of this data.Amount of rainfall
Week 1 4 inches
Week 2 2 inches
Week 3 6 inches
The average rainfall during these three weeks was 4 inches.
Find the average of this data.The Hip Hop Club’s CD Collections
Nathaniel 15
Belinda 21
Kareem 14
Angelo 17
Jessie 33
The average number of CDs owned by the members of the Hip Hop Club’s members is 20.
Find the average of this data.Books in the classroom library
Realistic fiction 18
Science fiction 17
Fairy Tales 5
Historical Fiction 12
Biographies 20
Poetry 30
How to books 5
Other nonfiction 13
There is an average of 15 of each genre in the classroom library.
Find the average of this data.Mr. Postman’s tie collection
Sports ties 10
Animal ties 7
Music ties 12
School ties 9
Mr. Postman has an average of 9.5 of each kind of tie.
Last one!Cities with over 100,000 people
Ohio 8
Texas 11
Pennsylvania 12
New York 13
Illinois 7
Michigan 9
Florida 10
California 16
Kansas 4
Virginia 6These states have an average of 9.6 cities with a
population of over 100,000.
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