Problem
Kelsey keeps track of how much money she makes each time she babysits. For the last 10 jobs she made: \( \$ 7.50, \$ 10.50, \$ 5.00, \$ 4.50, \$ 3.50, \$ 7.50, \$ 4.00, \$ 10.00, \$ 7.50 \), and \( \$ 5.00 \). What is the mean amount of money Kelsey made? A. \( \$ 5.50 \) B. \( \$ 6.25 \) c. \( \$ 6.50 \) D. \( \$ 7.00 \) E. \( \$ 7.50 \)
Solution
Step 1 ：Add the amounts: \(\$7.50 + \$10.50 + \$5.00 + \$4.50 + \$3.50 + \$7.50 + \$4.00 + \$10.00 + \$7.50 + \$5.00 = \$65.00\)
Step 2 ：There are 10 jobs, so divide the total by 10: \(\frac{\$65.00}{10}\)
Step 3 ：Calculate the mean: \(\$6.50\)
