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 consumed alcohol. Enter your answer in decimal form and round to your answer to two decimal places.

Number of Accidents in the Last Year None One or More Alcohol Involved Yes 0.01 0.01 No ? 0.21

Explanation / Answer

As the sum of probabilities is 1 so we have the table entries as

  

Now the proportion of drivers that consumed alcohol is 0.01+0.01=0.02

Number of Accidents in the Last Year None One or More Alcohol Involved Yes 0.01 0.01 No 0.77 0.21

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