Question

Question 43 The table summarizes results from 987 pedestrian deaths that were caused by automobile accidents. Driver Intoxicated? Pedestrian Intoxicated? Yes No 53 73 229 632 Yes No If two different pedestrian deaths are randomly selected, find the probability that they both involved drivers that were intoxicated. Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol. prob = % Submit Question

Answer 1

Answer :

Given data is :

Driver intoxicated	Pedestrain intoxicated		Total
	Yes	No
Yes	53	73	126
No	229	632	861
Total	282	705	987

Grand total = 987

therefore,

Probability of first driver intoxicated = Total of driver intoxicated / Grand total

= 126 / 987

= 0.128

Probability of second driver intoxicated is (From remaining 986 people) = 125 / 986

= 0.127

So,

Probability that they both involved drivers that were intoxicated = 0.128 * 0.127

= 0.0163

= 1.63 %

Required probability = 1.6