1. “Don’t be so MEAN!” Words spoken by an AVERAGE man.

2. Average A number that typifies a set of numbers of which it is a function. Huh?

3. Mean The average value of a set of numbers. Huh?

4. Average=Mean The average is the mean. The mean is the average. Huh?

5. 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 Andrew5 rocks5 Shequeta10 rocks10 Karen2 rocks2 Byron7 rocks+ 7 5 + 10 + 2 + 7 = 24 24 ÷ 4 = 6 So the average number of rocks collected was 6.

6. Here’s another example. The Aqua Club Feona3 fish3 Lynda2 fish2 Chris10 fish10 Peter6 fish6 Cherelle4 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.

7. You can find the average of your test grades. Sam’s Spelling Grades Jan. 990 %90 Jan. 1685 %85 Jan. 2582 %82 Feb. 1100 %100 Feb. 8100 %100 Feb. 1588 %+ 86 90 + 85 + 82 + 100 + 100 + 86 = 543 543 ÷ 6 = 90.5 So the average of Sam’s spelling grades is 90.5 which is rounded up to 91 which is an A.

8. Find the average of this data. Amount of rainfall Week 14 inches Week 22 inches Week 36 inches The average rainfall during these three weeks was 4 inches.

9. Find the average of this data. The Hip Hop Club’s CD Collections Nathaniel15 Belinda21 Kareem14 Angelo17 Jessie33 The average number of CDs owned by the members of the Hip Hop Club’s members is 20.

10. Find the average of this data. Books in the classroom library Realistic fiction18 Science fiction17 Fairy Tales5 Historical Fiction12 Biographies20 Poetry30 How to books5 Other nonfiction13 There is an average of 15 of each genre in the classroom library.

11. Find the average of this data. Mr. Postman’s tie collection Sports ties10 Animal ties7 Music ties12 School ties9 Mr. Postman has an average of 9.5 of each kind of tie.

12. Last one! Cities with over 100,000 people Ohio8 Texas11 Pennsylvania12 New York13 Illinois7 Michigan9 Florida10 California16 Kansas4 Virginia6 These states have an average of 9.6 cities with a population of over 100,000.