A sample of n = 8 scores has a mean of M = 10.After one score is removed from the sample,the mean for the remaining score is found to be M = 11.What was the score that was removed?
A)X = 3
B)X = 7
C)X = 8
D)X=10

Question

A sample of n = 8 scores has a mean of M = 10.After one score is removed from the sample,the mean for the remaining score is found to be M = 11.What was the score that was removed?​
A)​X = 3
B)​X = 7
C)​X = 8
D)​X=10

Quizplus · Accepted Answer

The total sum of the original 8 scores is 8 * 10 = 80. After removing one score, the total sum of the remaining 7 scores is 7 * 11 = 77. The difference, 80 - 77 = 3, is the score that was removed.

A Sample of N = 8 Scores Has a Mean