[单选题]

A random sample of 100 computer store customers spent an average of $75 at the store. Assuming the distribution is normal and the population standard deviation is $20, the 95% confidence interval for the population mean is closest to:

A.$71.08 to $78.92.

B.$73.89 to $80.11.

C.$74.56 to $79.44.

参考答案与解析：

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