having trouble with this material

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 rate with 80 % of its flights arriving on time. A test is conducted by randomly selectingSouthwest flights and observing whether they arrive on time.

Would it be unusual for Southwest to haveflights arrive on time?

Find the probability that at least9flights arrive on time >

thanks for the help