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Mathematics, 12.07.2019 16:00 maxy7347go

The owners of an eyeglass store claim that they fill customers' orders, on average, in 60 minutes with a standard deviation of 15.9 minutes. based on a random sample of 40 orders, a reporter determines a mean order time of 63 minutes. let µ represent the average number of minutes to fill an order. what is the z-statistic?

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