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statistics From a sample of 64 motorists working in Cape Town, the sample average time that it takes them to drive to work is 36

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From a sample of 64 motorists working in Cape Town, the sample average time that it takes them to drive to work is 36 minutes. It is known that the population standard deviation is 20 minutes. Construct a 99% condence interval for the actual average time it takes all motorists in Cape Town to drive to work. What is the lower limit of the interval? U

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