Sam scored the following grades in his end of year exams If

Sam scored the following grades in his end of year exams: If the outlier was not included, by what % would his mean grade increase?

Solution

Mean grade initialy =

= (61+65+71+85+92+36+81+77) / 8

= 568 / 8

= 71

Mean grade after excluding outlier

= (61+65+71+85+92+81+77) / 7

= 76

So the increase is by 5 points

% increase is (5/71)*100 = 7.04