A Sample of 100 Items Has a Population Standard Deviation $\left[ \begin{array} { l l } 11.60 & 31.60\end{array} \right]$

Multiple Choice

A sample of 100 items has a population standard deviation of 5.1 and a mean of 21.6.Construct a 95 percent confidence interval for ?.

A) $\left[ \begin{array} { l l } 11.60 & 31.60\end{array} \right]$
B) $\left[ \begin{array} { l l } 21.16 & 22.04\end{array} \right]$
C) $\left[ \begin{array} { l l } 20.60 & 22.60\end{array} \right]$
D) $\left[ \begin{array} { l l } 20.76 & 22.43\end{array} \right]$