11.47 Lactose intolerance. Lactose intolerance causes diffi culty 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 peo ple 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."

(a) What percent of the entire population is lactose intoler ant?

(b) What percent of people who are lactose intolerant are Asian?