The following data show the number of hours worked by 200 st

The following data show the number of hours worked by 200 statistics students. Refer to Exhibit 3-1. The cumulative relative frequency for the class of 10 -19

Solution

cumulative relative frequency is the ratio of sum of all numbers upto current class, divided by total numbers

i.e, (40 + 50) / (200) = 0.45