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Math Help - Finding Mean/Variance from Sum of fi

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    Finding Mean/Variance from Sum of fi

    Wondering if anyone could help with this question, i am lost on how to start.

    Attachment 21110

    The formula u = x + 20 is used to find the standard deviation of the values of x given in a frequency table. It if found that sigma fi = 40, sigma uifi = 112 and sigma ui squared fi = 10208. Find the mean and variance of the values of x.
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