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 6.5
B) cannot be determined
C) is 7.2
D) none of these
E) is 7.5

Question

Quizplus · Accepted Answer

To find the overall mean, you multiply the mean hours by the number of individuals in each group and then divide by the total number of individuals. For males: 6 hours * 30 males = 180 hours. For females: 9 hours * 20 females = 180 hours. Total hours = 360 hours. Total individuals = 30 males + 20 females = 50 individuals. Overall mean = 360 hours / 50 individuals = 7.2 hours.

The Mean Number of Hours Worked for the 30 Males