At a local grocery store, time spent waiting in line at the "quick check-out" follows a Normal distribution, with a mean of 3.4 minutes and a standard deviation of 0.5 minutes. Approximately what percentage of customers wait in line less than 2.8 minutes? Choose the answer that is closest to what you calculate.

Group of answer choices

More than 20%

6.68%

15.87%

8.08%

11.51%