54 CHAPTER 2 Descriptive Statistics In Exercises 43 and 44, use the data set and the indicated number of classes to construct (a) an expanded frequency distribution, (b) a frequency histogram, (c) a frequency polygon, (d) a relative frequency histogram, and (e) an ogive. 43. Pulse Rates Number of classes: 6 Data set: Pulse rates of all students in a class 68 105 95 80 90 100 75 70 84 98 102 70 65 88 90 75 78 94 110 120 95 80 76 108 44. Hospitals Number of classes: 8 Data set: Number of hospitals in each of the 50 states (Source: American Hospital Directory) 12 92 50 75 345 54 34 8 216 114 14 40 17 141 98 58 75 108 78 52 21 105 56 88 68 16 106 10 29 14 73 37 26 197 148 99 38 176 12 63 26 109 382 36 95 7 62 75 36 14