A random sample of 100,000 credit sales in a department store showed an average sale of $87.25. From past data, it is known that the standard deviation of the population is $20.00. What is the 95% confidence interval of the population mean?
A. $87.22 to $87.28
B. $87.13 to $87.37
C. $19.97 to $20.03
D. $19.88 to $20.12
Answer: B
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