The following data show the number of hours overtime by 300 workers last month.

(a) Find the class width for this distribution.

(b) Determine the number of workers who have overtime 14 hours or less.

(c) Find the relative frequency who have overtime more than 9 hours.

(d) Find the cumulative relative frequency for the class of 5 14.

Frequency 40 85 Number of Hours 0-4 5-9 10-14 15 - 19 20-25 70 65 40