Question

A sample of n = 7 scores has a mean of = 8. a second sample has n = 3 scores with a mean of = 12. if the two samples are combined, what is the mean for the combined score?

Answer 1

9.2

Explanation:

First sample: 7 scores; mean = 8

Second sample: 3 scores; mean = 12

The total score of the first sample is 8 × 7 = 56

The total score of the second sample is 3 × 12 = 36

The total score of both samples combined is 56 + 36 = 92

n for both samples combined is: n = 7 + 3 = 10

mean score of both samples combined = 92/10 = 9.2