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    Hush193's Avatar
    Hush193 Posts: 2, Reputation: 1
    New Member
     
    #1

    May 14, 2008, 07:57 AM
    Determining the Probability
    Hi,

    I have the following question and do not know where to look for an answer:

    Historical data indicates that the diameter of a ball bearing is normally distributed with a mean of 0.525 cm and a standard deviation of 0.008 cm. Suppose that a sample of 16 ball bearings are randomly selected from a very large lot. Determine the probability that the average diameter of a ball bearing is greater than 0.530 cm.

    Any help is appreciated.

    Thanks! :)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    May 14, 2008, 08:05 AM
    Use the formula to find the z-score corresponding, then look it up in a z-table.

    Remember, you want greater than, so subtract from 1.

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