A population of N = 10 scores has a mean of μ = 6.After one score is removed,the mean is found to be M = 5.What is the value of the score that was removed?
A)X = 10
B)X = 5
C)X = 3
D)X = 15

Question

Quizplus · Accepted Answer

The total sum of the original scores is N * μ = 10 * 6 = 60. After removing one score, the new total sum is (N-1) * M = 9 * 5 = 45. The difference between the original sum and the new sum gives the value of the removed score: 60 - 45 = 15.

A Population of N = 10 Scores Has a Mean