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3. A random sample of 86 LED light bulbs had a mean life of x= 542 hours with a standard deviation of o = 32

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3. A random sample of 86 LED light bulbs had a mean life of x= 542 hours with a standard deviation of o = 32 hours. Construct a 90 percent confidence interval for the mean life, M, of all light bulbs of this type. 2020 joan kessler distancemath.com A) 536

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