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Math Help - Calculate Weighted Average

  1. #1
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    Calculate Weighted Average

    Would it be correct to calculate the weighted average of the following scores by multiplying the score by the weight for all and then adding this up, or am I supposed to divide by something?

    Ex.

    Intern had 4 rotations worth 20% of overall score

    Score %
    R1 4 20%
    R2 4 20%
    R3 3 20%
    R4 3 20%

    there are 10 teammate qualities/dimensions that they are rated on
    Score % Weight
    D1 4 2%
    D2 4 2%
    D3 4 2%
    D4 3 2%
    D5 5 2%
    D6 4 2%
    D7 4 2%
    D8 3 2%
    D9 4 2%
    D10 4 2%

    Would I find the weighted avg by doing the following?:

    (R1*.2)+(R2*.2)+(R3*.2)+(R4*.2)+(D1*.2)+(D2*.2)... ..+(D10*.2)

    Thanks
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  2. #2
    Senior Member eumyang's Avatar
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    Quote Originally Posted by DKRbella0814 View Post
    Would I find the weighted avg by doing the following?:

    (R1*.2)+(R2*.2)+(R3*.2)+(R4*.2)+(D1*.2)+(D2*.2)... ..+(D10*.2)

    Thanks
    Almost. The D's should be multiplied by .02.
    (R1*.2)+(R2*.2)+(R3*.2)+(R4*.2)+(D1*.02)+(D2*.02).....+(D10*.02)
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by eumyang View Post
    Almost. The D's should be multiplied by .02.
    (R1*.2)+(R2*.2)+(R3*.2)+(R4*.2)+(D1*.02)+(D2*.02).....+(D10*.02)
    Here the weights sum to 1 so the above is OK, but in general they wont and you wiould need to divide the above by the sum of the weights.

    CB
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