We are asked to find the probability that neither the pedestrian nor the driver was intoxicated.
Probability is given by
P = number of desired outcomes/total number of outcomes
From the given table we know that
Total number of pedestrian deaths = 977
The desired outcomes are
Driver intoxicated = No and Pedestrian intoxicated = No (584)
So the probability is
P = 584/977
P = 0.5977
Therefore, the probability that neither the pedestrian nor the driver was intoxicated is 0.5977