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# If 90% of all people between the ages of 30 and 50 drive a car, and assuming a sample of 20 people in that age group:

If 90% of all people between the ages of 30 and 50 drive a car, and assuming a sample of 20 people in that age group:a)What are the mean and standard deviation of the number of people who drive a car in this age group?b)What is the probability that exactly 20 people drive a car?