Math 9 Unit 9 Send-In Assignment 5. A Recreation Centre wants to survey its 560 members about the activities they prefer. They are asked if they would prefer Spin Cycle, Aerobics, Rock Climbing or Weight Lifting There are 140 members in each of the four groups. a) What is the probability that a member of any group will choose weight lifting? 5604=140 25% 140 +560 = 0.23 0.25 = 25% b) Based on part a) above, predict how many of the 560 members will choose weight lifting. 140 c) What assumptions did you make? The results of the survey are displayed below. Group Spin Cycle Aerobics Male 24 Rock Weight Total Climbing Lifting 19 50 47 140 Adults Female 21 29 69 21 140 Adults Male 37 22 67 14 140 Teenagers Female 23 34 54 29 140 Teenagers d) Based on the survey results, predict the probability that a member will choose weight lifting. #7+21 +14 +29 = 111 111 560 = 0.19 0.19 = 19% e) Compare your answers for parts a) and d). Explain any differences. Page 7 of 12 Unit 9