a sample of n=10 scores has a mean of m=9. One person with a score of x=0 is removed from the sample.What is the new value for the new sample mean?

Answer 1

If the mean of 10 scores is 9, then we need to first find the sum of those 10 scores.

10*9 = 90

Now we just reduce the n by 1, since the sum of the scores stays the same, and divide by the new n which is 9

90/9 = 10 <-- the new mean