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A study of 80 white mice showed that their average weight was 3.7 ounces. The standard deviation of the population is 0.6 ounces.

A study of 80 white mice showed that their average weight was 3.7 ounces.  The standard deviation of the population is 0.6 ounces.  Which of the following is the 95% confidence interval for the mean weight per white mice?
a. (2.52,4.88)
b. (3.54, 3.86)
c.  (3.57, 3.83)
d.  (3.39,4.01)

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