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In a certain population, the probability that a person chosen at random catches a pandemic disease...

In a certain population, the probability that a person chosen at random catches a pandemic disease is 0.05. Suppose that the probability that the population catches the disease follows a normal distribution.
(a)   What is the probability that more than 45% of the population catches the disease?
(b)   What is the probability that less than 85% of the population catches the disease?

Math   Statistics-And-Probability   
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