Having difficulty with statistics problem (Stem-leaf) diagram I never used this website before, but if anyone could help me with this then that will be great. Also, if I tagged my question in the wrong topic, please point me in the right direction as well.
What numbers represents following Stem-and-Leaf Diagram? Stems: 2, 3, 4 Leaf: 0,3,5,6: 1, 4, 6: 7,9
A. 2, 3, 4, 0, 1, 7, 3, 4, 9, 5, 6, 6 
B. 0, 3, 5, 6, 1, 4, 6, 7, 9 
C. 20, 22, 24, 25, 31, 33, 34, 39, 41, 42 
D. 20, 23, 25, 26, 31, 34, 36, 47, 49 
 A: If your diagram looks like the following:
\begin{align}
2 &\mid 0\ 3\ 5\ 6 \\
3 &\mid 1\ 4\ 6 \\
4 &\mid 7\ 9
\end{align}
Then the stems are the tens digits and the leaves that appear to the right of each stem are the units digit for that stem. 
So, from the top stem, we get $20, 23, 25, 26$. From the middle stem, we get $31,34,36$. From the bottom stem, we get $47, 49$.
A: Here's a little trick of elimination since it's a multiple choice. A and B are definitely out since they do not take into account the stems. 
Now take a look at the first stem, which is a $2$. The leafs of the stems, $0,3,5,6$ would automatically mean that you should see the values $20, 23, 25$ and $26$ in the dataset. This automatically rules out C. 
How can I be sure? Look at C again and observe how it contains $22$. This should indicate that $2$ has to be a leaf in the first stem. Since that is not there, I can safely eliminate it, which leaves with D.
It seems to me like an examination question, and hence I answered it with that strategy in mind. 
