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Math Help - Weighted Averages

  1. #1
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    Weighted Averages

    What is the weighted average?

    if a=50%,b=25%,c=20%,d=5%.

    Value of a=136.5/255,
    b = 75/75
    c =19/20
    d = 30/30.
    I keep getting different answers. Can someone explain the right way to do this?
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  2. #2
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    Re: Weighted Averages

    Quote Originally Posted by kads View Post
    What is the weighted average?

    if a=50%,b=25%,c=20%,d=5%.

    Value of a=136.5/255,
    b = 75/75
    c =19/20
    d = 30/30.
    I keep getting different answers. Can someone explain the right way to do this?
    What value are you getting?
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  3. #3
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    Re: Weighted Averages

    What do "136.5/255", "75/75", "19/20", and "30/30" mean? If they are not simply fractions, which does not seem likely, what I don't know what you mean. Further, you are confusing things by using the same letters, "a", "b", "c", and "d" for both them an their respective weights.

    If you had four NUMBERS, A, B, C, and D, with "weights" 50%, 25%, 20%, 5%, respectively, then the "weighted average" would be .5A+ .25B+ .2C+ .05D.
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  4. #4
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    Re: Weighted Averages

    Quote Originally Posted by kads View Post
    if a=50%,b=25%,c=20%,d=5%.
    Value of a=136.5/255,
    b = 75/75
    c =19/20
    d = 30/30.
    [.5(136.5/255) + .25(1) + .2(19/20) + .05(1)] / [136.5/255 + 1 + 19/20 + 1] = .2496....
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