A national traffic accident survey investigates the role of

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.

Solution

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