The mean number of hours worked for the 30 males was 6, and for the 20 females was 9. The
Overall mean number of hours worked …
A) is 7.2
B) is none of these.
C) cannot be determined.
D) is 7.5
E) is 6.5

Question

Quizplus · Accepted Answer

The overall mean number of hours worked can be calculated as the weighted average of the mean number of hours worked by males and females. The weight for males is 30/50 and the weight for females is 20/50. Therefore, the overall mean number of hours worked is (30/50) * 6 + (20/50) * 9 = 7.2.

The Mean Number of Hours Worked for the 30 Males