Coffeehouse survey, part 2.

Look again at the data from the coffeehouse survey in Exercise 53.

a) If we select a person at random, what’s the probability we choose a person between 18 and 24 years old who is spending more time at coffeehouses?

b) Among the 18- to 24-year olds, what is the probability that the person responded that they are not spending more time at coffeehouses?

c) What’s the probability that a person who spends the same amount of time at coffeehouses is between 35 and 44 years old?

d) If the person responded that they spend more time, what’s the probability that they are at least 65 years old?

e) What’s the probability that a person at least 65 years old spends the same amount of time?

f) Are the responses to the question and age independent?