In a Prince Market Research survey of 2518 motorists, 252 said that they made an obscene gesture

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In a Prince Market Research survey of 2518 motorists, 252 said that they made an obscene gesture in the previous month.

a. If 1 of the surveyed motorists is randomly selected, what is the probability that this motorist did not make an obscene gesture in the previous month?

b. If 50 of the surveyed motorists are randomly selected without replacement, what is the probability that none of them made an obscene gesture in the previous month?

Find the probabilities and indicate when the “5% guideline for cumbersome calculations” is used.

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