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Math Help - Calculating a new average from a old average, without knowing the numbers.

  1. #1
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    Calculating a new average from a old average, without knowing the numbers.

    I have to calculate a average based on a old average in a voteing system.
    but each vote's value have not been stored only the actual vote as count
    so what is availible to use is

    (exsample)
    Old average number : 50
    Ammount of votes : 732

    And now i want to add new values to that number when there have been
    a vote.

    Like this

    New vote value is between 1-75
    a user votes 10.

    so im guessing the calculation is something like this

    (oldaverage + newvote) / (votecount + 1 new vote)

    But it seems off.. any ideas
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  2. #2
    MHF Contributor
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    Ottawa, Canada
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    65
    (732*50 + 10) / 51
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  3. #3
    Newbie
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    Esbjerg, Denmark
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    Thank you wery much..
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