The time it takes a control processing unit to process a certain type of job is normally distributed with mean 20 seconds and standard deviation 3 seconds. If a sample of 15 such jobs is observed, what is the probability that the sample standard deviation in processing time will exceed 3.465 seconds?
Added by Jennifer H.
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We know that the population mean ($\mu$) is 20 seconds and the population standard deviation ($\sigma$) is 3 seconds. Show more…
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