data set:
45, 50, 65, 66, 75, 40, 55, 58, 30, 42
30, 40, 42, 45, 50, 55, 58, 65, 66, 75
the median: 52.5
the mean:52.6
The difference of the mean and median is: 52.6-52.5=0.1
so the answers are:
B.) The median is 52.5
C.) The difference of the mean and median is 0.1