Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours 0-9 10-19 20-29 30-39 Frequency 20 80 200 100 14) a. is 9 Refer to Exhibit 2-1. The class width for this distribution b. is 10 C. d. 15) a b. C. is 39, which is: the largest value minus the smallest value or 39-0-39 varies from class to class Refer to Exhibit 2-1. The midpoint of the last class is 50 34 35 3335 d. 34.5 Refer to Exhibit 2-1. The number of students working 19 hours or less is 80 +16) b. is 100 C. is 180 d. 17) is 300 a 20% Refer to Exhibit 2-1. The percentage of students working 10-19 hours is b. 25% C. 75% d. 80% 18) a. 20% b. 25% Refer to Exhibit 2-1. The percentage of students working 19 hours or less is + C. 75% d. 80% D