Lactose intolerance causes difficulty digesting dairy products that contain lactose (milk sugar). It is particularly common among people of African and Asian ancestry. In the United States, 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.. What percent of the entire population is lactose intolerant?

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