Find the Confidence Interval Specified $\sigma = 11.7$ Milligrams $95 \%$ Confidence Interval for the True Mean Cholesterol Content

Multiple Choice

Find the confidence interval specified.
-A laboratory tested 85 chicken eggs and found that the mean amount of cholesterol was 190 milligrams. Assume that $\sigma = 11.7$ milligrams. Construct a $95 \%$ confidence interval for the true mean cholesterol content, $\mu$ , of all such eggs.

A) $186.7$ to $193.3$ milligrams
B) $187.0$ to $193.0$ milligrams
C) $187.5$ to $192.5$ milligrams
D) $187.9$ to $192.1$ milligrams