Among a group of people, 10% are from NYC and 90% are not. All people from NYC are under 18 years old, and 70% of those not from NYC are also under 18 years old. One person is chosen at random, and he or she is under 18. What is the probability that the person chosen is from NYC? Round your answer to two decimal places.
NYC = 10
~NYC = 90
NYC & 18 = 10
~NYC & 18 = .70*90 = 63
Knowing that there are 73 18-yr-olds, and that 10 of them are from NYC, ...