Mathematics, 25.11.2020 14:00 kmchippps
Johnson Electronics Corporation makes electric tubes. It is known that the standard deviation of the lives of these tubes is 140 hours. The company’s research department takes a sample of 110 such tubes and finds that the mean life of these tubes is 2100 hours.
Required:
What is the probability that this sample mean is within 24 hours of the mean life of all tubes produced by this company?
Answers: 3
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Johnson Electronics Corporation makes electric tubes. It is known that the standard deviation of the...
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