Answer:
D
Step-by-step explanation:
First, we get the mean and median of the first data set WITH 5 years : mean = 15 median = 14, then remove the 5 years mean = 15.222 median = 14
The mean will increase but the median will remain the same.
With the 5 years:
Mean = 15
Median = 14
Without the 5 years:
Mean = 15.222222222222
