The mean lifetime of electric light bulbs produced by a company has in the past been 1120 hours with a standard deviation of 125 hours. A sample of 20 bulbs revealed a standard deviation in the lifetimes of 150 hours. Would you conclude that this is unusual? Explain.© BrainMass Inc. brainmass.com October 2, 2022, 7:42 pm ad1c9bdddf
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