The lifetime for a certain brand of incandescent light, Basic Statistics

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The lifetime for a certain brand of incandescent light

The lifetime for a certain brand of incandescent light bulbs is normally distributed. A random sample of five of these light bulbs had a mean lifetime of 520 hours and standard deviation of 50 hours. Give a 95% confidence interval for the mean lifetime of all incandescent light bulbs of this brand.

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Basic Statistics: The lifetime for a certain brand of incandescent light

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