Random Sample

If $X_1,X_2,....... X_n$constitute a random sample from an infinite population with mean $\mu$ and variance $\sigma^2$, obtain $E[\bar x]$ and $Var(\bar x)$
If $X_1,X_2,....... X_n$constitute a random sample from an infinite population with mean $\mu$ and variance $\sigma^2$, obtain $E[\bar x]$ and $Var(\bar x)$