College Statistics, Intro

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A worker for the American Red Cross wants to predict the average number of blood donations of college students. He takes a random sample of 900 students. But then he is puzzled and asks you:
" In my sample most of the students have zero donations and the percentages go down as the number of donations goes up. It does not sound look anything like a Normal distribution, so how can I use a Normal distribution in making my prediction?"

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