After every score in a sample is multiplied by 3,the mean is calculated and found to be M = 21.What was the mean for the original scores?
A)7
B)3
C)21
D)63

Question

After every score in a sample is multiplied by 3,the mean is calculated and found to be M = 21.What was the mean for the original scores?​
A)​7
B)​3
C)​21
D)​63

Quizplus · Accepted Answer

When every score in a sample is multiplied by a constant (in this case, 3), the mean of the transformed scores is also multiplied by that constant. Therefore, to find the original mean, you divide the new mean (21) by 3, resulting in 7.

After Every Score in a Sample Is Multiplied by 3,the