The numbers of hours worked (per week) by 400 statistics students are shown below. $$\begin{array} { l l }
\text { Number of hours } & \text { Frequency } \
0 - 9 & 20 \
10 - 19 & 80 \
20 - 29 & 200 \
30 - 39 & 100
\end{array}$$ The cumulative percent frequency for

Question

The numbers of hours worked (per week) by 400 statistics students are shown below. $$\begin{array} { l l } 
\text { Number of hours } & \text { Frequency } \
0 - 9 & 20 \
10 - 19 & 80 \
20 - 29 & 200 \
30 - 39 & 100
\end{array}$$  The cumulative percent frequency for < 29 hours is
A) 50.
B) 75.
C) 200.
D) 300.

Quizplus · Accepted Answer

The cumulative frequency for < 29 hours is 20 + 80 + 200 = 300. The cumulative percent frequency is (300/400) * 100 = 75%.