The Dollar Value Of Orders Placed Through A Particular Store Catalog Is Found To (1)

The dollar value of orders placed through a particular store catalog is found to be normally 

distributed with a standard deviation of $21.58. A sample of 30 orders averaged $81.25. What is 

the 90% confidence interval around this sample mean? 

A) $81.25 ± $10.79 B) $81.25 ± $21.58 C) $81.25 ± $12.15 D) $81.25 ± $6.48 

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