Question: Let \[{{X}_{1}},...,{{X}_{10}}\] be identically distributed independent random variables such that

\[E({{X}_{i}})=1\] and \[Var({{X}_{i}})=4\]. What is the standard deviation of a random variable \[X\], where \[X=\] \[\frac{{{X}_{1}}+...+{{X}_{10}}}{10}\] ? (8 points)