The scores for 21 students on an exam are
summarized in the stemplot below.
Exam Scores
4
5
69
7 125567
8 012455699
9
90147
Key: 910 = 90% on the exam
The teacher realizes that a mistake was made and the
student whose score was recorded as 49% should
have been 69%. If the mistake is corrected, what effect
will this have on the mean and median scores?
O The mean and median will both increase.
O Neither the mean nor the median will change.
O The mean will increase but the median will
decrease.
O The mean will increase but the median will be
unchanged.