Answer:
a)59.125, b)67.5, c)None
Explanation:
Mean = All values added up and divided by the number of values

Median = Put all numbers in order from least to most and use the middle one, if there are two, use the mean of those two
. The middle ones are 60 & 75 so

Mode = The number that repeats more times. In this case none of them repeat.