ANSWER
1/18
EXPLANATION
There are 36 possible outcomes for the two dice: 6 possible outcomes for each die.
The only ways there are for the dice to sum 11, is that the first die is 5 and the second is 6, or the other way around. So, the two favorable outcomes are (5, 6) and (6, 5).
The theoretical probability is,
[tex]P=\frac{\text{favorable outcomes}}{\text{possible outcomes}}=\frac{2}{36}=\frac{1}{18}[/tex]Hence, the probability that the sum of two rolled dice is 11, is 1/18