$x_i$ are drawn from a distribution with mean 
$\mu$. So expected value (aka mean or average) of each of $x_i$ must be ]3$\mu$.
are drawn from a distribution with mean . So expected value (aka mean or average) of each of must be ]3.
$x_i$ are drawn from a distribution with mean $\mu$. So expected value (aka mean or average) of each of $x_i$ must be $\mu$.
Xi's are drawn from a distribution with mean M. So expected value (aka mean or average) of each of Xi's must be M]3.
Xi's are drawn from a distribution with mean M. So expected value (aka mean or average) of each of Xi's must be M.
are drawn from a distribution with mean . So expected value (aka mean or average) of each of must be ]3.
