Question: Question 5 = A random sample of 105 light bulbs had a mean life of 441 hours with a population standard deviation of =

Question 5 = A random sample of 105 light bulbs had a

Question 5 = A random sample of 105 light bulbs had a mean life of 441 hours with a population standard deviation of = 40 hours. Construct a 90% confidence interval for the mean life, u, of all light bulbs of this type.

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