Consider an infinite population with a mean of 160 and a standard deviation of 25. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals: $\begin{array}{|l|l|}
\hline \text { A. } & 12.649 \
\hline \text { B. } & 25.0 . \
\hline \text { C. } & 2.56 . \
\hline \text { D. } & 3.125 . \
\hline
\end{array}$

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The Answer of Consider an infinite population with a mean of 160 and a standard deviation of 25. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals: $\begin{array}{|l|l|}
\hline \text { A. } & 12.649 \
\hline \text { B. } & 25.0 . \
\hline \text { C. } & 2.56 . \
\hline \text { D. } & 3.125 . \
\hline
\end{array}$

Consider an Infinite Population with a Mean of 160 and a Standard