A national traffic accident survey investigates the role of alcohol in automobil

Question

A national traffic accident survey investigates the role of alcohol in automobile accidents. Drivers note the number of accidents they were involved in during the last year and whether they had consumed alcohol before the accident(s). You are given the following table of joint probabilities:

Calculate the proportion of drivers that were involved in zero accidents or consumed alcohol. Enter your answer in decimal form and round to your answer to two decimal places.

Explanation / Answer

P(zero accidents or consumed alcohol) = P(zero accidents) + P(consumed alcohol) - P(zero accidents and consumed alcohol)

                                                      = (0.03 + 0.63) + (0.03 + 0.02) - 0.03

                                                      = 0.68

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