The table summarizes results from 989 pedestrian deaths that were caused by automobile accidents.
Pedestrian Deaths
Driver
Intoxicated? Pedestrian Intoxicated?
Yes No
Yes 52 86
No 266 585
If one of the pedestrian deaths is randomly selected, find the probability that the pedestrian was intoxicated or the driver was not intoxicated.
To find the probability that the pedestrian was intoxicated or the driver was not intoxicated, we need to find the number of cases where either the pedestrian was intoxicated or the driver was not intoxicated, and divide it by the total number of cases.
From the table, we can see that there are three possibilities:
1. Pedestrian intoxicated and driver not intoxicated: This is given by the number in the intersection of "Yes" for pedestrian and "No" for driver, which is 86.
2. Pedestrian not intoxicated and driver not intoxicated: This is given by the number in the intersection of "No" for pedestrian and "No" for driver, which is 585.
3. Pedestrian intoxicated and driver intoxicated: This is given by the number in the intersection of "Yes" for pedestrian and "Yes" for driver, which is 52.
So, the total number of cases where either the pedestrian was intoxicated or the driver was not intoxicated is 86 + 585 = 671.
The total number of pedestrian deaths is given as 989.
Therefore, the probability that the pedestrian was intoxicated or the driver was not intoxicated is 671/989, which is approximately 0.678 or 67.8%.