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The probability of being a universal donor is 8% (O-negative-blood type). Suppose that 20 people come to a blood drive. What are the mean and

The probability of being a universal donor is 8% (O-negative-blood type). Suppose that 20 people come to a blood drive.

What are the mean and standard deviation of the number of universal donors among the 20 people?

What is the probability that there are 2 or 4 universal donors?

What is the probability there are at least 3 universal donors?

What is the probability there are at most 3 universal donors?

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