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[单选题]

An analysis determined that approximately 99 percent of the observations of daily sales for a company were within the interval from $250,900 to $580,000 and that daily sales for the company were normally distributed. The mean daily sales and standard deviation of daily sales, respectively, for the company were closest to:
Mean daily sales　　　　Standard deviation of daily sales

A.$415,000　　　　　　　$41,667

B.$415,000　　　　　　　$55,000

C.$355,115　　　　　　　$41,667

参考答案与解析：

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