Question

The mean (average) of 5 numbers is 130. If one of the numbers is recorded incorrectly as 59 instead of 95, what would be the correct mean? A) 126.52 B) 140 C) 130 D) 137.2

Answer 1

D

Explanation:

(5 number total) / 5 = 130 <=====given

(5 number total) = 5 * 130 = 650

but 59 was in there instead of 95

subtract the 59 from the total and then add the 95

650 - 59 + 95 = 686 is the correct total for the 5 numbers , so the average becomes 686 / 5 = 137.2