Review Exercises 1. Hospitals The following set of data represents the number of hospitals for selected states. Find the mean, median, mode, midrange, range, variance, and standard deviation for the data. 53 84 28 78 35 111 40 166 108 60 123 87 84 74 80 62 Source: World Almanac. 2. Elementary and Secondary Schools These data represent the number of both elementary and secondary schools for selected states. Elementary Secondary 938 977 194 518 403 423 85 156 711 599 1196 497 424 327 401 362 824 885 137 575 240 333 44 205 139 913 417 849 43 274 223 285 For each set of data find: a. Mean e. Range b. Median f. Variance c. Mode g. Standard deviation d. Midrange Which set of data is more variable? Source: World Almanac. 3. Battery Lives Twelve batteries were tested to see how many hours they would last. The frequency distribution is shown here. Hours Frequency 1-3 4 6 7-9 10-12 13-15 Find each of these. a. Mean C. Variance b. Modal class d. Standard deviation