Hi!
In this question i can only help with the 2nd part!
Part B:
Mean:
65 + 67 + 66 + 70 + 72 + 68 + 69 / 7
477 / 7
= 68.142 = 68
Median:
65, 66, 67, 68, 69, 70, 72
Median = 68
Mode:
There is no mode
Range:
65, 66, 67, 68, 69, 70, 72
72 - 65 = 7
Range = 7