If the mean of a set of 36 scores is 27 and two more scores of 40 and 42 are added, what is the new mean?

Answer 1

The mean is calculated with this general formula:
mean= (sum of numbers in a set)/(# of numbers)

You know that for a set of 36:
Mean=27
# of numbers=36

So:
27=(sum of numbers in a set)/36
which can be rearranged as:
sum of numbers in a set=27*36
sum of numbers in a set=972

Then, add your two new scores, and change the "number of numbers" to 38, and solve for the mean.

I hope that was clear (:

Answer 2

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