statistics (probibility help)

Question

The table summarizes results from 988 pedestrian deaths that were caused by automobile accidents.

Pedestrian DeathsDriver	Intoxicated?Pedestrian Intoxicated?
Yes	No
Yes	51	77
No	234	626

If one of the pedestrian deaths is randomly selected, find the probability that the driver was not intoxicated but the pedestrian was.

Probability =

Answer 1

To find the global probability, you need to use the formula (observations within your subgroup) / (total observations).

The table shows 234 deaths occurring with a driver who was not intoxicated and a pedestrian who was intoxicated. It also states that there are 988 total observations.

The probability of a randomly selected observation being in this group is

(observations within your subgroup) / (total observations) = 234/988 = .2368.