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    jda1509's Avatar
    jda1509 Posts: 1, Reputation: 1
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    #1

    Jan 5, 2011, 09:40 PM
    Need help with statistics question...
    Mean height of men, mean 68 inches and a standard deviation of 2.5 inches.
    What is the probability of a man selected at random will have a hight above 72 inches?
    A sample of 49 meant, what is the probaility that the mean hight is greater than 67 inches (using standard score table)?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jan 9, 2011, 12:19 AM

    By standard score table, you mean the Normal Distribution?

    If so, first define your variable, that is the height.

    Let X be the height of a man.



    Then,

    Find the z-score and look up your table for the corresponding probability. Make a sketch if needed to confirm your answer.
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