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Time for long-distance phone calls

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The length of time for long-distance phone calls has been found to be normally distributed, with a mean of 24.7 minutes and a standard deviation of 4.7 minutes. In a randomly selected sample of 50 calls, what is the sample average call time below which 10% of sample average call times will be shorter? (2 decimal places)

Reference no: EM131786366

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