Suppose only 70% of all drivers in a state regularly wear a seat belt. A random sample

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Suppose only 70% of all drivers in a state regularly wear a seat belt. A random sample of 500 drivers is selected. What is the probability that
a. Between 320 and 370 (inclusive) of the drivers in the sample regularly wear a seat belt?
b. Fewer than 325 of those in the sample regularly wear a seat belt? Fewer than 315?

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Modern Mathematical Statistics With Applications

ISBN: 9783030551551

3rd Edition

Authors: Jay L. Devore, Kenneth N. Berk, Matthew A. Carlton

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