There was a study done that found that 21% of people have returned a piece of clothing after they have worn it. If I speak to 20 people: a. How many people would I expect to have worn a piece of clothing and returned it?

b. What is the probability that exactly 6 of the 20 people have worn a piece of clothing and returned it?

c. What is the probability that at least one person has worn a piece of clothing and returned it?