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Math Help - statistic

  1. #1
    Junior Member
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    statistic

    the average lenght of a hospital stay is 5.9 days if we assume a normal distribution and a standard deviation of 1.7 days 15% of hospital stays are less than how many days? 25% of hospital stays are longer than how many days?
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  2. #2
    MHF Contributor
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    These are z-score lookup problems.

    What z-score keeps 15% in the left tail? I'll call it 'a'.

    Then (Days-5.9)/1.7 = a. Solve for 'Days'.
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