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 (not including other
groups and people who consider themselves to belong to more than one race), 47% of the population is
white, 35% Hispanic, 14% is black, and 4% is Asian. Moreover, 15% of whites, 20% Hispanic, 70% of blacks,
and 90% of Asians are lactose intolerant. Suppose we select a U. S. person at random.