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.A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is 750 hours.A random sample of 36 light bulbs

.A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is 750 hours.A random sample of 36 light bulbs has a mean life of 735 hours.If we assume that the population standard deviation is 45 hours, is there sufficient evidence to suggest that the mean life of these light bulbs is actually less than the manufacturer claims?the significance level is 0.05

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