7th Grade Math

494 Statistical Displays

= Step-by-Step Solutions begin on page R1.

Extra Practice begins on page EP2.

Find the mean, median, and mode for each data set. Round to the nearest

tenth if necessary.

Example 1

6. scores earned on a math test: 87, 71, 95, 98, 48, 74, 83, 92, 87, 79

(^77) ages of professional football players: 25, 23, 23, 27, 39, 27, 23, 31, 26, 28
8.
Total Points Scored During
Recent Basketball Season
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9.
Gas Mileage
of Various Vehicles
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Example 2 10. HEIGHT The heights of plants, in inches, are 13, 4, 6, 9, 11, 23, and 7.
Which measure is most affected by the extreme value?

11. TEST SCORES Patty had scores of 90, 95, 65, 90, and 85 on five math tests.
    Which measure is most affected by the extreme value?

Example 3 12. STUDENTS The ages of the students in Ages of Students

12 13 12 12 12

12 14 12 12 12

13 12 12 13 12

12 12 13 11 12

Ms. Watson’s seventh-grade class are given in

the table. Which measure of central tendency

best represents the ages? Justify your selection

and then find the measure.

13. SONGS The number of weeks that songs have Top 20 Country Songs
    6 14172428
    8 15202531
    9 15202536
    13 16 22 26 43

been on the Top 20 Country Songs list is shown

in the table. Would the mean, median, or mode

best represent the data? Explain.

B 14. INCOME The five employees at Burger Bun each earn $8.50 per hour. The

assistant manager earns $14.00 per hour. How would each measure of

central tendency change if the manager’s pay of $18.55 per hour was

included?

15. The mean of a set of fifteen numbers is 5.2. What is the sum of the fifteen
    numbers?

490_497_C09_L1_895130.indd 494 1/11/10 9:31 AM