Airline companies calculate the flight hours of their pilots for evaluation. If the pilot's average flight hours 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 must attend training. What are the flight hours of these pilots?