In a market research survey of 2809 motorists, 288 said that they made an obscen

Question

In a market research survey of 2809 motorists, 288 said that they made an obscene gesture in the previous month. Complete parts (a) and (b) below. 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? The probability is 8975. (Round to four decimal places as needed.) If 40 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? Should the 5% guideline be applied in this case? Select the correct choice below and fill in the answer box within your choice. (Round to four decimal places as needed.) The probability is The 5% guideline should not be applied in this case. The probability is The 5% guideline should be applied in this case.

Explanation / Answer

a) Probability will be =(2809-288)/2809 = 0.8975 (rounded to four decimal places)

b) Here p = 0.8975 and n = 40

Probability will be = COMBIN(2521,40)/COMBIN(2809,40) = 0.0128

and Option B is correct

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