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    frosst's Avatar
    frosst Posts: 2, Reputation: 1
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    #1

    Sep 27, 2007, 10:41 AM
    liklihood with certainty 5(1)
    you are randomly selecting 100 people from a population that is normally distributed. Are you certain to get exactly 95 people who lie within two standard deviations of the mean?

    Explain this please...
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Sep 27, 2007, 01:23 PM
    This is the Empirical Rule.

    68% lies within 1 standard deviation, 95% lies within two, and 99.7 lies within 3.
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