Question

13.The data in the following table summarize results from 157 pedestrian deaths that were caused by accidents. If three different deaths are randomly selected without​ replacement, find the probability that they all involved intoxicated drivers.

_ Pedestrian_Intoxicated Pedestrian_Not_Intoxicated

Driver_Intoxicated 4 20

Driver_Not_Intoxicated 10 123

The probability is____

​(Round to six decimal places as​ needed.)

Is such an event unlikely

no, because its probability is greater than 0.05

Yes, because its probability is greater than 0.05

no, because its probability is less than 0.05

Yes, because its probability is less than 0.05

14. In a market research survey of 2006 ​motorists, 281 said that they made an obscene gesture in the previous month. Complete parts​ (a) and​ (b) below.

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?

The probability is___.

​(Round to four decimal places as​ needed.)

B. if (a number) 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.)

A. The probability is ______. The​ 5% guideline should be applied in this case.

B. The probability is ______. The​ 5% guideline should not be applied in this case.

Answer 1

13)

	Pedestrian_Intoxicated	Pedestrian_Not_Intoxicated	total
driver intoxicated	4	20	24
Driver_Not_Intoxicated	10	123	133
total	14	143	157

without replacement problem      
      
P(three deaths involved intoxicated drivers) = 24/157*23/156*22/156=   0.003178

Is such an event unlikely

Yes, because its probability is less than 0.05

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