Dan and Glenn are swimming buddies who love to challenge themselves while diving. The amount of time Dan can hold his breath underwater, D, is 111 seconds with a standard deviation of 12.5 seconds. The amount of time Glenn can hold his breath underwater, G, is 105 seconds with a standard deviation of 10.9 seconds. Assume that D and G are independent random variables and X = D – G. What is the probability that on any given dive Dan holds his breath for less time than Glenn?

0.108
0.359
0.397
0.641