8a) The monthly rainfall is 3.6
8b) Deviation for May is 1
Deviation for June is 2.725
Deviation for July is 0.65
8c) Yes, the average annual rainfall was exceeded by 0.525
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Look at the picture..............
The surface area of a sphere is given by

where r represents the radius.
As the radius is given as 60 meters we replace r with 60 in the formula above to get the surface area.