Name________________________

CALCULATING THE MEAN #4--KEY

Directions: Calculate the mean for each set of numbers below.  To find the mean of a set of numbers, add all of the data together, then divide that sum by the amount of numbers in the set.

Example:  Mike received the following scores on his Math tests:  100, 90, 80, 100, 90.  Find his mean test score.

100 + 90 + 80 + 100 + 90 = 460 total points              460/5 tests gives you a mean of 92 points

1)      Steve received the following scores on his Math tests:  100, 80, 70, 100, 60, 70.  Find his mean score.

480/6 = A mean of 80 points

2)      Melissa received the following amounts as graduation gifts:  \$20, \$25, \$25, \$50, \$10, \$20, \$20, \$30.  Find the mean amount of her gifts.

200/8 = A mean of \$25

3)      Derrick scored the following amount of points during his basketball season: 12, 8, 10, 8, 2, 12, 14, 10, 8, 6. Find his mean scoring average.

90/9 = A mean of 10 points

4)      Jennifer recorded the following temperatures while researching her science project:  90, 60, 55, 60, 55, 75, 75, 70, 75, 80, 75.  Find the mean temperature that she recorded.

770/11 = A mean of 70 degrees

5)      Carlos watched 3 hours of TV on Monday, 2 on Tuesday, 1 on Wednesday, 0 on Thursday, 3 on Friday, 2 on Saturday, and 3 on Sunday.  What is the mean number of hours of TV that he watched that week?

14/7 = A mean of 2 hours

6)      DeAndre earned the following amount while working his summer job each week:  \$100, \$80, \$90, \$60, \$100, \$20, \$80, \$90, \$100, \$80, \$80.  What is the mean amount that he earned each week?

880/11 = A mean of \$80

7)      Don read the following number of pages of his favorite book each night before bed:  10, 20, 10, 20, 40, 10, 10, 20, 40.  What is the mean number of pages that he read every night?

180/9 = A mean of 20 pages

8)      Michelle did the following number of sit-ups every day to get ready for soccer season:  25, 25, 30, 40, 50, 50, 50, 50.  What is the mean number of sit-ups that she did each day?

320/8 = A mean of 40 sit-ups

9)      Anthony earned the following amount for baby sitting his brother over winter break:  \$5, \$10, \$10, \$10, \$5, \$10, \$20, \$10, \$5, \$20, \$20, \$20, \$10, \$5, \$5.  What is mean amount that he earned each day?

165/15 = A mean of \$11

10)  Jason spent the following number of minutes on his homework last week:  10, 20, 30, 20, 20, 20, 20.  What is the mean amount of time that he spent on his homework?

140/7 = A mean of 20 minutes