In a Study of the Incidence of Rickets in Tibetan

Short Answer

In a study of the incidence of rickets in Tibetan children, a total of 1,551 urban and nonurban children were examined. Of these 1,012 had rickets. Of the 245 urban children in the study, 87 had rickets. Use Venn diagrams to determine how many children in nonurban areas had rickets, and how many children in nonurban areas did not have rickets.
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a. __________ children in nonurban areas had rickets
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b. __________ children in nonurban areas did not have rickets