a sample of n=6 scores has a mean of m=13 . If one person with a score of x=3 is removed from the sample, what is the value for the new mean?

Answer 1

If the mean of 6 scores is 13, then we need to first find the sum of those 15 scores.

6*13 = 78

Now we can subtract 3 from this

78-3=75

and divide by the new n which is 5

75/5 = 15 <-- the new mean