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Math Help - Normal distr

  1. #1
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    sthlm
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    Normal distr

    Problem 5.21 Newbold
    See image

    My attempt:
    1. See image2

    2. Searching for it in this table Public Domain Normal Distribution Table
    I find z=0.06


    3. Thus, a=0.06

    Correct?
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Normal distr

    a) The z-score for 0.4 is z=\frac{0.4-0.2}{0.05}=4, but your table only goes up to z=3.09 so we would use the approximation:

    P(X>4)=0
    Last edited by MarkFL; November 29th 2012 at 02:10 AM.
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  3. #3
    MHF Contributor MarkFL's Avatar
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    Re: Normal distr

    Using numeric integration, I find:

    P(X>4)\approx0.00003167124184
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  4. #4
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    Re: Normal distr

    Sorry, I didn't say that I was trying to do e. (But yes, in a. P ≈ 0).
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