For each class interval of the frequency distribution given, determine the class midpoint, the relative frequency, and the cumulative frequency.
|
Class Interval
|
Frequency
|
|
20-under 25
|
17
|
|
25-under 30
|
20
|
|
30-under 35
|
16
|
|
35-under 40
|
15
|
|
40-under 45
|
8
|
|
45-under 50
|
6
|