A survey of the people living in a particular suburb found that the probability that a person above the age of 21 has ever been overseas is $0.27$, and the probability that someone who is 21 years old or younger has ever been overseas is $0.07$. It is known that the proportion of the people living in that suburb who is above the age of 21 is $0.54$. a) What is the chance that a randomly selected person living in the suburb has been overseas? Number (Enter your answer correct to 3 decimal places) b) A randomly chosen person living in the subrb has been overseas. What is the probability that they are above the age of 21 ? Number