ANSWER
1/18
Step-by-step 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,
Hence, the probability that the sum of two rolled dice is 11, is 1/18