Determining Probability: Car Example Problems

If 80% of all people between the ages of 30 and 50 drive a car, find these probabilities for a sample of 20 people in that age group:

a. Exactly 18 drive a car.
b. 16 or more drive a car.
c. At most 15 drive a car.

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...r)

a) r = 18

P(18) = C(20, 18) 0.8^18 0.2^2 = 0.1369

b) m = np = 20 * 0.8 = ...