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Math Help - normal distribution

  1. #1
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    normal distribution

    If X is N(7,4), find P[15.364 \le (X-7)^{2} \le 20.096].

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  2. #2
    Newbie jaco's Avatar
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    standardize to Z~N(0,1) then Z^2~chi(1)
    P(3.841<Z^2<5.024)=0.975-0.95=0.025
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