There is a certain disease in america which is very rare, Ask an Expert

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There is a certain disease in America which is very rare. The probability of a person having the disease is 1 in 100,000,000. Assume that there are 310,000,000 people in the US.

a) Approximate the probability that no one in the US actually has the disease.

b) Approximate the probability that at most 3 people in the US have the diseas.

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