Question

A professor tells his class that the mean score on their first exam was 50 (there is no possible maximum value). He announces that he will add 20 points to each student's score. What is the new mean after each student has received those extra 20 points

Answer 1

It will add 20

Explanation:

If the mean is 50, we can make the guess that maybe there are 10 children with all 50. If we add 20 then the mean becomes 70.