(13.36) Here is the distribution of the adjusted gross income (in thousands of dollars) reported on individual federal income tax returns in 2011: Income <15 15−29 30−74 75−199 ⩾200 Probability 0.264 0.218 0.298 0.186 0.034 (a) What is the probability that a randomly chosen return shows an adjusted gross income of $30,000 or more? P(income ⩾ $ 30,000) (±0.001) = (b) Given that a return shows an income of at least $30,000, what is the conditional probability that the income is at least $75,000? P(income ⩾ $ 75,000 | income ⩾ $ 30,000) (±0.001) =