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The life in hours of a 75-watt light bulb is known to be

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The life in hours of a 75-watt light bulb is known to be normally distributed with s=25 hours. A random sample of 20 bulbs has a mean life of x =1014 hours.

(a) Construct a 95% two-sided confidence interval on mean life.

(b) Construct a 95% lower-confidence bound on the mean life.

Reference no: EM13580521

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