Airline companies calculate the flight hours of their pilots to evaluate management. If the average flight hours for pilots at the company is 6800 hours with a standard deviation of 800 hours. Count:

a. Chances are a pilot has more than 8000 flight hours.

b. The chances of a pilot having flying hours are between 5000 hours and 7000 hours.

c. The company determines a rule that a pilot must take part in a series of training if his flying hours do not meet the minimum standard of flying hours determined by the company. If there are 20% of pilots who have to attend training, what are the flight hours of these pilots?