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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Answer:

Step-by-step explanation:
To multiply radicals with the same root, you just need to multiply the numbers or expressions inside the root retaining the same root and then simplify the result.
In this case: 
Answer:
74.2 million children under the age of 18
Step-by-step explanation:
If you are looking for decimals yes but if not then no