posted by Gail on .
For a class test, the mean score was 65, the median score was 71 and sthe standard deviation of the scores was 7. The teacher decided to add 5 points to each score due to a grading error. Which of the folloiwng must be true for thenew scores?
Hmmmm. the mean is now 70, the median is now 76, and the standard deviation is 7. That is not a smart way to curve grades, usually.