It depends on what the experiment is.
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Probability that the sum is 6 = 5/36 Probability that the sum is 7 = 6/36
The probability is 0.
1-2
Assuming you mean when rolling 2 dice, the probability is the number of ways of getting the sum of 5 over the number of possible outcomes. 4 ways of getting 5 (1+4; 2+3; 3+2; 4+1) 36 outcomes (6 x 6) the probability is 4/36 = 1/9
With two normal six-sided dice, the maximum sum can only be 12 (6 x 2 dice), so there is zero probability of rolling a sum that adds to 16.