A group of people were asked if they had run a red light in the last year. 325 responded "yes", and 294 responded "no".

Question

Find the probability that if a person is chosen at random, they have run a red light in the last year.

Answer 1

no way to tell.

However, the probability that they answered "yes" to the question is

325/(325+294) = 0.525

Assuming the 619 people were chosen at random.

Poorly worded problem.

Answer 2

A couple plans to have three children. What is the probability that.
a) they have all boys?
b) they have at least one girl?

Answer 3

couple plans to have three children. What is the probability that.
a) they have all boys?
b) they have at least one girl?