A sample of n = 5 scores has a mean of M = 12. If one new score with a value of X = 17 is added to the sample, what is the value for the new mean?

Answer 1

Mean (M) = sum of values (S)/ number of values (N)

for M = 12 and N = 5, solve for S:

12 = S/5

S = 60

Value of 17 added to S, so S is now 77 and N is now 6.

Can use equation to solve for new M:

M = 77/6 = 12.83