Question

A population of n ????20 scores has a mean of???????? 15. one score in the population is changed from x ???? 8 to x ???? 28. what is the value for the new population mean?

Answer 1

20 has been added to the total of scores, so the new mean for the 20 scores will be 20/20 = 1 higher than it was.

The new population mean is 15+1 = 16.