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    las29223's Avatar
    las29223 Posts: 4, Reputation: 1
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    #1

    Jun 28, 2012, 11:01 AM
    Statistics
    Scores on a test are normally distributed with a mean of 60.6 and a standard deviation of 10.3. find P81, which separates the bottom 81% from the top 19%

    Is it 0.291 or 69.7 or 63.6 or 0.88 ? Please help
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 28, 2012, 11:31 AM
    There are two obviously wrong answers and you should be able to calculate the 81st percentile.

    What did you get from your calculations?
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