Answer: Suppose only 75% of all drivers in a certain state

Chapter 4, Problem 4.63

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Suppose only 75% of all drivers in a certain state regularly wear a seat belt. A random sample of 500 drivers is selected. What is the probability that a. Between 360 and 400 (inclusive) of the drivers in the sample regularly wear a seat belt? b. Fewer than 400 of those in the sample regularly wear a seat belt?

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