The lower and upper control limits for a $$begin mathsize $12$px style x with bar on top end style$$ chart for a process is $12\mathrm{.}36$ and $23\mathrm{.}82$ respectively. Consider the following two samples:

I : $15\mathrm{.}6,19\mathrm{.}1,22\mathrm{.}9,19\mathrm{.}4$

II : $24\mathrm{.}3,18\mathrm{.}6,27\mathrm{.}3,22\mathrm{.}9$

Which sample$($s$)$ signal the process mean is out of control?