22. (2004 National College Entrance Examination, Zhejiang Province) In a box, there are 10 balls of the same size, among which 3 balls are labeled 1, 4 balls are labeled 2, and 3 balls are labeled 5. The first time, one ball is randomly taken from the box, and after it is put back, another ball is randomly taken the second time (assuming the possibility of drawing each ball is the same). Let the sum of the labels of the balls taken in the first and second draws be $\xi$.
(I) Find the distribution of the random variable $\xi$;
(II) Find the expectation $E \xi$ of the random variable $\xi$.
22. (I) The values and distribution of the random variable $\xi$ are as follows:
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline$\xi$ & 2 & 3 & 4 & 6 & 7 & 10 \\
\hline$P$ & 0.09 & 0.24 & 0.16 & 0.18 & 0.24 & 0.09 \\
\hline
\end{tabular}
(II) $E \xi=2 \times 0.09+3 \times 0.24+4 \times 0.16+6 \times 0.18+7 \times 0.24+10 \times 0.09=5.2$.