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Math Help - measures of spread

  1. #1
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    measures of spread

    This is from a text...

    Height(cm) l deviation, x-mu l (x-mu)^2
    183...........18.....................324
    165............0......................0
    148............-17...................289
    146............-19...................361
    181............16.....................256
    178.............13....................169
    154.............-11...................121
    Total: 1155.....0....................1520

    ...and I don't understand how you get the answers from the middle column
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  2. #2
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    Quote Originally Posted by perron View Post
    This is from a text...

    Height(cm) l deviation, x-mu l (x-mu)^2
    183...........18.....................324
    165............0......................0
    148............-17...................289
    146............-19...................361
    181............16.....................256
    178.............13....................169
    154.............-11...................121
    Total: 1155.....0....................1520

    ...and I don't understand how you get the answers from the middle column
    x represents height. Have you calculated the value of mu, the mean height?
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  3. #3
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    Whew, hey thanks for your help! =)
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