Probability of an Event: P(event) = number of outcomes in event / total number of outcomes Conditional Probability: P(A | B) = P(A & B) / P(B)
Work Step by Step
a.) P(smokes) = 1,213 / 6,549 = 0.1852 b.) P(smokes | high income) = 247 / 2,115 = 0.1168 c.) No, the probability of a person being a smoker depends on whether or not the person has a high income, because the answers to (a) and (b) differ.