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    Confidence Interval, Average expected Lifetime

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    A GE flourescent bulb's useful life is normally distrbuted. We wish to estimate the mean lifetime. A random sample of 15 bulbs are:

    2,222 hrs standard deviation of 310 hrs

    Refer to table 7A

    a) Determine 95% confidence interval
    b) If an executive can say the the average expected lifetime is 2,200, is he right?

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    https://brainmass.com/statistics/confidence-interval/confidence-interval-average-expected-lifetime-312276

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