(1 point) The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best reate with 80 % of its flights arriving on time. A test is conducted by randomly selecting 11 Southwest flights and observing whether they arrive on time. (a) Find the probability that exactly 6 flights arrive on time. (b) Would it be unusual for Southwest to have 11 flights arrive on time? (Enter YES or NO)