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5. Blood. According to the Red Cross, about 42% of Americans have Type A blood. Suppose 80 people show up at a typical blood drive.

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5. Blood. According to the Red Cross, about 42% of Americans have Type A blood. Suppose 80 people show up at a typical blood drive. What's the expected proportion of people who are Type A? b) What's the standard deviation of the Type A propor- tions found at such drives

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