Question

The table summarizes results from 985 pedestrian deaths that were caused by automobile accidents.

Driver Intoxicated?	Pedestrian Intoxicated?
	Yes	No
Yes	56	72
No	263	594

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

Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol.
prob = %

Answer 1

Given:

The table summarizes results from 985 pedestrian deaths that were caused by automobile accidents.

Driver Intoxicated?	Pedestrian Intoxicated?
	Yes	No	Total
Yes	56	72	128
No	263	594	857
Total	319	666	985

If one of the pedestrian deaths is randomly selected, the probability that the pedestrian was intoxicated or the driver was not intoxicated :

P(pedestrian was intoxicated or the driver was not intoxicated)

= P(pedestrian was intoxicated) + P(driver was not intoxicated) - P( pedestrian was intoxicated and driver was not intoxicated)

= 319/985 + 857/985 - 263/985

= 319 + 857 - 263 / 985

= 913/985

= 0.927

= 92.7%

Therefore the probability that the pedestrian was intoxicated or the driver was not intoxicated is 92.7%