Warning times for tornadoes are approximately bell-shaped with mean 14 minutes and standard deviation 2.8 minutes. (a) What is the probability a randomly selected warning time is at most 9.9 minutes? (Use 3 decimals.) (b) What is the warning time of the shortest 6% of all warning times? (Use 3 decimals.) minutes (c) If a random sample of 9 warning times is taken, what is the probability that the average time will be more than 12.5 minutes?