Lactose intolerance Lactose intolerance causes difficulty in digesting dairy products that contain lactose

(milk sugar). It is particularly common among people of African and Asian ancestry. In the United States (ignoring other groups and people who consider themselves to belong to more than one race), 82% of the population is white, 14% is black, and 4%

is Asian. Moreover, 15% of whites, 70% of blacks, and 90% of Asians are lactose intolerant.19 Suppose we select a U.S. person at random.

(a) What is the probability that the person is lactose intolerant? Show your work.

(b) Given that the person is lactose intolerant, find the probability that he or she is Asian. Show your work.