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It is assumed that the lifetime, in hours, of the 60 Watt bulbs obeys a normal law of variance 625 hours2 . A random sample

It is assumed that the lifetime, in hours, of the 60 Watt bulbs obeys a normal law of variance 625 hours2 . A random sample is taken from 20 bulbs. The average life of these is 1014 hours. 1. Construct a 95% confidence interval of the average lifespan light bulbs.

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