2.51 A survey of 100 resort club managers on their annual salaries resulted in the following frequency distribution. (See Exercise 2.39 on p. 69.)

Annual Salary 15–25 25–35 35–45 45–55 55–65

($1000s)

No. of Managers 12 37 26 19 6

a. Prepare a cumulative frequency distribution for the annual salaries.

b. Prepare a cumulative relative frequency distribution for the annual salaries.

c. Construct an ogive for the cumulative relative frequency distribution found in part b.