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Math Help - Weighted Averages

  1. #1
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    Weighted Averages

    Hi,
    Ok, if for example i purchased a car. There would be a total cost but if i split the parts off an average would make the engine worth the same amount as a wheel nut. How could i know how much each item actually cost me. I have read that weighted avearges are what i need.
    Thanks
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by benhathaway View Post
    Hi,
    Ok, if for example i purchased a car. There would be a total cost but if i split the parts off an average would make the engine worth the same amount as a wheel nut. How could i know how much each item actually cost me. I have read that weighted avearges are what i need.
    Thanks
    This is the formula for weighted averages:


    \overline x _{(i)}  = \frac{{\sum\limits_{i = 1}^k {n_i \overline x _i } }}<br />
{{\sum\limits_{i = 1}^k {n_i } }}<br />


    EDIT: It could just be me... But the question doesn't make much sense to me.
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