P(yes) = (#yes)/(total #)
However, that assumes that the group were randomly chosen, and that they told the truth. Just because they said yes, that does not mean they actually ran a red light.
The problem is very poorly worded.
A group of people were asked if they had run a red light in the last year. 238 responded "yes", and 196 responded "no".
Find the probability that if a person is chosen at random, they have run a red light in the last year
1 answer
1 answer