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Thread: Normal distibution

  1. #1
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    Normal distibution

    help with b)


    a) mean = 31 and s.d = 1.98
    b) i dont really know how to use those values to work out an expected value....

    thanks.
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  2. #2
    MHF Contributor Unknown008's Avatar
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    Using what you were told, you get:

    w \sim N(31, 1.98^2)

    Then, find the probability of:

    P(25 < w < 27)
    P(27 < w < 29)
    P(29 < w < 31)
    P(31 < w < 33)
    P(33 < w < 35)
    P(35 < w < 37)

    But you'll also see that:
    P(29 < w < 31) = P(31 < w < 33)
    P(27 < w < 29) = P(33 < w < 35)
    P(25 < w < 27) = P(35 < w < 37)

    Those are the percentage distributions of the eggs. Multiply by 100 to get the number of eggs.
    Last edited by Unknown008; Oct 10th 2010 at 10:03 PM.
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  3. #3
    MHF Contributor Unknown008's Avatar
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    Oh, sorry, I made a typo. My bad

    I'm correcting it as soon as possible.
    Last edited by mr fantastic; Oct 11th 2010 at 12:34 AM.
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