posted by Sharon .
A sample of n _ 11 scores has a mean of M _ 4. One person with a score of X _ 16 is added to the sample.
What is the value for the new sample mean?
The sum of 11 scores was 4x11 = 44
The sum of 12 scores becomes 44 +16 = 60
The new mean (of 12 scores) is 60/12 = 5