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Math Help - Standard Deviation

  1. #1
    Junior Member
    Joined
    Mar 2008
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    Standard Deviation

    I need help with this question below:

    A window frame maker test the first 1000 to see if the new latching system works correctly. Use the typical values for control limits.

    What % would be the expected outcome in a smaple mean that is within+ or - 3 standard deviation of the distribution mean?

    Thanks in advance,
    Last edited by mr fantastic; August 7th 2011 at 01:48 PM. Reason: Title.
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