Answer:
50 times
Step-by-step explanation:
First we need to find the possible values that will make the sum 7:
(1,6), (2,5), (3,4), (4,3), (5,2), (6,1)
There are 6 possible combinations among the 36 possible results (6 for each dice), so the probability of rolling a sum of 7 is 6/36 = 1/6
If we repeat the process 300 times, we could expect that the number of times that the sum will be 7 will be:
300 * (1/6) = 300/6 = 50 times
