The following table lists salary distribution of full-time instructors in a community college. Complete the relative frequency and cumulative relative frequency columns
|
Salary ($)
|
Number of Instructors
|
Relative Frequency
|
Cumulative Relative Frequency
|
|
28,000 up to 33,000
|
5
|
|
|
|
33,000 up to 38,000
|
6
|
|
|
|
38,000 up to 43,000
|
4
|
|
|
|
43,000 up to 48,000
|
3
|
|
|
|
48,000 up to 53,000
|
7
|
|
|
(a) How many instructors earn less than $33,000?
(b) Seventy-two percent of instructors earn less than what amount?