782 CHAPTER 12 Statistics 30. Commuting Distance Eighteen employees at a company were asked how many miles they commute, one way, to work. The responses are as follows. Construct a stem-andleaf display. For single digit data, use a stem of 0. * 8 1115182232 8 1217202635 9 1417213041 31. College Credits Eighteen students in a geology class were asked how many college credits they had earned. The responses are as follows. Construct a stem-and-leaf display. * 10 15 24 36 48 45 42 53 60 17 24 30 33 45 48 62 54 60 32. Ages Fifteen people at a college library were asked their age. The responses are as follows. Construct a stem-andleaf display. * 17 20 21 22 32 18 20 21 25 37 19 21 22 26 42 In Exercises 33–34, part (c), construct the frequency polygon on the same axes as the histogram. See Fig 12.9. 33. Visiting an Art Museum The ages of a random sample of 40 people visiting an art museum are 20 26 31 34 39 45 50 62 20 29 31 35 40 47 51 63 23 30 32 35 40 49 51 66 23 30 33 37 40 49 54 69 26 30 34 38 42 49 57 72 a) Construct a frequency distribution with a first class of 20–30. * b) Construct a histogram. * c) Construct a frequency polygon. * d) Construct a stem-and-leaf display. * 34. Starting Salaries Starting salaries, in thousands of dollars, for social workers with a bachelor of science degree and no experience are shown for a random sample of 25 different social workers. 42 43 44 46 48 43 43 44 46 48 43 43 45 47 48 43 44 45 47 49 43 44 45 47 49 a) Construct a frequency distribution. Let each class have a width of one. * b) Construct a histogram. * c) Construct a frequency polygon. * d) Construct a stem-and-leaf display. * In Exercises 35 and 36, use class marks on the horizontal axis. 35. Histogram and Frequency Polygon Use the frequency distribution from Exercise 9 to create a a) histogram * b) frequency polygon * 36. Histogram and Frequency Polygon Use the frequency distribution from Exercise 10 to create a a) histogram * b) frequency polygon * 37. Number of Televisions per Home Use the histogram below to answer the following questions. 1 2 3 4 5 6 7 8 Number of Homes Televisions per Home Number of Televisions 0 1 2 3 4 5 6 a) How many homes were included in the survey? 28 b) In how many homes were four televisions observed? 4 c) What is the modal class? 2 d) How many televisions were observed? 75 e) Construct a frequency distribution from this histogram. * 38. Car Insurance Use the histogram below to answer the following questions. 7 8 Annual Car Insurance Premiums for Students 650 701 752 803 854 905 956 1007 1 2 3 4 5 6 Annual Amount (dollars) Number of Students Ufuk Uyanik/Alamy Stock Photo $ *See Instructor Answer Appendix
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