Mathematics, 22.08.2019 17:20 crystalpearl188

The average life of light bulbs produced by saba electric co. is believed to be normally distributed with the mean service life of 950 hours and a standard deviation of 100 hours. a random sample of 100 bulbs is tested and it has a mean life of 930 hours. can it be concluded that the mean service life of the bulbs is less than the expectation at significant level of 0.01?

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