Question: Steele Electronics. Inc. sells expensive brands of stereo equipment in several shopping malls throughout the northwest section of the United States. The Marketing Research De­partment of Steele reports that 30 percent of the customers entering the store that indicate they are browsing will, in the end, make a purchase. Let the last 20 customers who enter the store be a sample.

(a) How many of these customers would you expect to make a purchase?

(b) What is the probability that exactly five of these customers make a purchase?

(c) What is the probability ten or more make a purchase?

(d) Does it seem likely at least one will make a purchase?