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Math Help - Z-Score Question

  1. #1
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    Question Z-Score Question

    Q: Suppose that X ~ N(-7,14). Find the value of x for which P(|X+7|<x)=0.44

    Work so far:
    -x < X + 7 < x
    -x-7 < X < x-7
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  2. #2
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    Re: Z-Score Question

    Hey xxlvh.

    Remember that (X-mu)/sigma ~ N(0,1) if X is Normal(mu,sigma^2) so try getting it into P(a < Z < b) form and then using the tables to get the values for a and b [Note that the Normal distribution is symmetric around 0 for a standardized normal so P(Z < -a) = P(Z > a) for a >= 0]
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