A group of 100 men undergo a cholesterol test where the mean is 200, the range is 125 to 275, the median is 180, and the standard deviation is 20. What is the 95% confidence interval of the mean?

A. 200 +/- 40

B. 200 +/- 2

C. 180 +/- 20

D. 125 to 175

E. 200 +/- 4


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