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Math Help - percentile

  1. #1
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    percentile

    What is percentile. I am learning calculating percentiles. Lets say we have 10 numbers 12,23,45,67,7,99,23,12,45,34. If you want to calculate 90th percentile then is it (90/100)*10=9.

    So is number 9 greater then 90% of the numbers.
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  2. #2
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    Quote Originally Posted by hartford27 View Post
    What is percentile. I am learning calculating percentiles. Lets say we have 10 numbers 12,23,45,67,7,99,23,12,45,34. If you want to calculate 90th percentile then is it (90/100)*10=9.

    So is number 9 greater then 90% of the numbers.
    See the Wikipedia article on percentile

    The 90-th percentile for your data is a value that is greater than 90% of the data. First sort your data into ascending order:

    7, 12, 12, 23, 23, 34, 45, 45, 67, 99

    which because the data is so sparse would strictly be 99. However Excel would calculate this to be 67+0.1*(99-67)=70.2.

    Anything above 67 would be a 90-th percentile, but if it has to be a data value it has to be 99.

    RonL
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