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A light bulb factory randomly selects 100 bulbs for service life inspection. The average life span is 1250 hours, and the standard deviation of the

A light bulb factory randomly selects 100 bulbs for service life inspection. The average life span is 1250 hours, and the standard deviation of the service life is 240 hours. If the average life span of all bulbs is between 1178 and 1322 hours, how reliable is it?

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