Statistics

The question is:
In a study of 420,000 cell phone users in Denmark. It found that 135 developed cancer of the brain or nervous system. If we assume that such a cancer is not affected by cell phone, the probability of a person having such a cancer is 0.000340.

a) Assuming that cell phones have no affect on cancer, find the mean and tandard deviation for the numbers of people in groups of 420,000 that can be expected to have cancer of the brain or nervous system.
b) Based on the results from part (a), it is unusual to find that among 420,000 people, there were 135 cases of cancer of the brain or nervous system? Why ot why not?
c) What do the results suggest about the publicized concern that cell phones are a health danger because they increase the risk of cancer of the brain or nervous system?

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