A random sample of 43 light bulbs has a mean life of 677, Ask an Expert

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A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 700 hours. A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim? Use a = 0.03

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