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In a random sample of 1,000 exams, the average score was 500 points with a standard deviation of 80 points. Find the interval about the sample mean such that the probability is 0.90 that the mean number lies within the interval.

  • math -

    90% = mean ± 1.645 SEm

    SEm = SD/√n

    I'll let you do the calculations.

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