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3. The distribution of scores on the SAT is approximately normal with a mean of A =500 and astandard deviation of o = 100. For

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3. The distribution of scores on the SAT is approximately normal with a mean of A =500 and astandard deviation of o = 100. For the population of students who have taken the SAT, (a) What proportion have SAT scores less than 400? (b) What proportion have SAT scores greater than 650

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