Notice that these are already in order so you can presume \(y_1 = 0.6\) million is the minimum and \(y_{50} = 38.3\) million is the maximum. Therefore, the midrange is given by
\begin{equation*}
\frac{0.6+38.3}{2} = \frac{38.9}{2} = 19.45 \text{million}.
\end{equation*}
In this collection of "states" data the District of Columbia is included so that the number of data items is n=51. The mean of this data takes a bit of arithmetic but gives
\begin{equation*}
\overline{x} = \frac{\sum_{k=1}^{51} y_k }{51} = \frac{316.1}{51} \approx 6.20
\end{equation*}
million residents.
Since the number of states is odd, the median is found by looking at the 26th order statistic. In this case, that is the 4.4 million residents of Kentucky, i.e. \(y_{26} = 4.4\text{.}\)