Last weekend police ticketed 18 men whose mean speed was 72 miles per hour, and 30 women going an average of 64 mph. Overall, what was the mean speed of all the people ticketed?
A) none of these
B) 69 mph
C) 67 mph
D) 68 mph
E) It cannot be determined.

Question

Quizplus · Accepted Answer

The mean speed can be calculated by taking the weighted average of the speeds of men and women. The formula is: (18 * 72 + 30 * 64) / (18 + 30) = 67 mph.

Last Weekend Police Ticketed 18 Men Whose Mean Speed Was