Name________________________

CALCULATING THE MEAN #5--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:  Daniel 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)      Joshua received the following scores on his Math tests:  80, 84, 100, 80, 70, 100, 60, 70.  Find his mean score.

644/8 = A mean of 80.5 points

2)      Melissa recorded the following heights of some of her classmates:  60 inches, 48 inches, 62 inches, 60 inches.  Find the mean height of her classmates.

230/4 = A mean of 57.5 inches

3)      Alexander measured the shoe size of his classmates and received the following data: 8, 7, 8, 6, 10, 5, 10, 8, 6, and 6.  Find the mean shoe size of his classmates.

74/10 = A mean of 7.4 inches

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

695/10 = A mean of 69.5 degrees

5)      Emma received the following amounts as graduation gifts:  \$40, \$25, \$25, \$50, \$10, \$20, \$20, \$30.  Find the mean amount of her gifts.

220/8 = A mean of \$27.50

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

990/11 = A mean of \$90

7)      Joseph read the following number of pages of his favorite book each night before bed:  14.5, 20, 10, 20, 40, 10, 10, 20, 40.  What is the mean number of pages that he read every night?

184.5/9 = A mean of 20.5 pages

8)      Emily did the following number of push-ups every day to get ready for soccer season:  29, 25, 30, 40, 50, 50, 50, 50.  What is the mean number of sit-ups that she did each day?

324/8 = A mean of 40.5 sit-ups

9)      Anthony earned the following amount for baby sitting his brother over summer break:  \$5, \$20, \$10, \$10, \$5, \$10, \$20, \$10, \$5, \$30, \$20, \$30, \$10, \$5, \$12.50.  What is mean amount that he earned each day?

202.5/15 = A mean of \$13.50

10)  Madison ran the following number of miles each day to prepare for the marathon:  6, 6, 7, 7, 8, 8, 9, 9, 10, 12, 14, 16, 18, 20, 20, 22, 24, 26, 26, 26.  Find the mean amount of miles she ran each day.

294/20 = A mean of 14.7 miles