A-38 ANSWERS 37. e) Number of Televisions Number of Homes 0 2 1 4 2 8 3 6 4 4 5 3 6 1 38. e) Price Number of Students 625– 675 2 676–726 4 727–777 6 778–828 8 829–879 7 880–930 3 931–981 0 982–1032 1 39. d) Number of Messages Number of People Number of Messages Number of People 3 2 7 3 4 3 8 8 5 7 9 6 6 4 10 3 e) 1 2 3 4 5 6 7 8 Number of People Number of E-mail Messages Sent Number of Messages 3 4 5 6 7 8 9 10 40. d) Number of Visits Number of Families 1 4 2 2 3 8 4 8 5 6 6 11 7 9 8 3 9 0 10 1 e) 2 Number of Visits 1 4 6 8 1 3 5 7 9 10 11 2345678910 Number of Families Number of Visits Selected Families Have Made to the San Diego Zoo 41. Tuition: $10,981 Room/board: $12,611 Books/supplies: $944 Other $4061 42. Laptop tray: 174 USB charger: 162 Blind spot mirror: 90 Magnetic phone mount: 48 Other 126 SECTION 12.3, PAGE 791 59. Answers will vary. The National Center for Health uses the median for averages in this exercise. 60. A 79 mean average on 10 quizzes gives a total of 790 points. An 80 mean average on 10 quizzes requires a total of 800 points. Thus, Jim missed a B by 10 points, not 1 point. 73. a) Ruth Mantle 0.290 0.300 0.359 0.365 0.301 0.304 0.272 0.275 0.315 0.321 SECTION 12.4, PAGE 802 25. d) If each number in a set of data is multiplied by n, the mean and standard deviation of the new set of data will be n times that of the original set of data. 26. d) If each number in a set of data is multiplied by n, the mean and standard deviation of the new set of data will be n times that of the original set of data. 33. b) The spread of the data about the mean is greater for the evening class, since the standard deviation is greater for the evening class.
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