1a) In a certain year, 89% of all Caucasians in the U.S., 75% ofall African-Americans, 75% of all Hispanics, and 74% of residentsnot classified into one of these groups used the Internet fore-mail. At that time, the U.S. population was 64% Caucasian, 11%African-American, and 14% Hispanic. What percentage of U.S.residents who used the Internet for e-mail were Hispanic? (Roundyour answer to the nearest whole percent.)
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1b)According to a study in a medical journal, 202 of a sample of5,990 middle-aged men had developed diabetes. It also found thatmen who were very active (burning about 3,500 calories daily) werea fifth as likely to develop diabetes compared with men who weresedentary. Assume that one in 12 middle-aged men is very active,and the rest are classified as sedentary. What is the probabilitythat a middle-aged man with diabetes is very active? (Round youranswer to four decimal places.)
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