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    scoughlin2's Avatar
    scoughlin2 Posts: 1, Reputation: 1
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    #1

    Jun 23, 2010, 08:55 AM
    Math homework
    The lengths of pregnancies are normally distributed with a mean of 272 days and a standard deviattion of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregancy between 272 days and 274 days

    Just a quick question.
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #2

    Jun 23, 2010, 09:30 AM
    Thank you for taking the time to copy your homework to AMHD.
    Please refer to this announcement: https://www.askmehelpdesk.com/financ...-b-u-font.html
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Jun 23, 2010, 09:51 AM

    Use your knowledge of the Normal Distribution Curve.

    Convert your values to the z value, and look up in your z table for the probabilities. Make a sketch of the curve to make sure that you are looking for the right area.
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