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Math Help - ughh, need help!!

  1. #1
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    ughh, need help!!

    hours/ week.......12....32.....35.....38.....42 T=159
    # of employees....1.....5.......7.......8......5 T=26
    (x-mu)............-23.8..-3.8..-0.8...2.2....6.2
    (x-mu)^2.......566.44...14.44...0.64...4.84...38.44 T=544.80


    determine the mean, variance, and standard deviation for the nurse's hours

    the mean is 35.8...

    I need to know which equations to use for variance and standard deviation...
    can someone show me the eq. needed to find each and (if there is) the sequence to find them?
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  2. #2
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    Quote Originally Posted by perron View Post
    hours/ week.......12....32.....35.....38.....42 T=159
    # of employees....1.....5.......7.......8......5 T=26
    (x-mu)............-23.8..-3.8..-0.8...2.2....6.2
    (x-mu)^2.......566.44...14.44...0.64...4.84...38.44 T=544.80


    determine the mean, variance, and standard deviation for the nurse's hours

    the mean is 35.8...

    I need to know which equations to use for variance and standard deviation...
    can someone show me the eq. needed to find each and (if there is) the sequence to find them?
    Do you not have class notes or textbook that give the forumulae and examples of how to use them?
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  3. #3
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    Oct 2008
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    yep, I have notes from class and I tried following the way my teacher did it but I can't seem to get the right answer!!

    my attempt to write out the formula...

    6= Ei fi (xi-x(with line))^2
    Ei fi

    AND
    6= Ei fi (xi-x(with line))^2
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