According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 100 are selected. What is the probability that the sample...

According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 100 are selected.

What is the probability that the sample proportion will have between 20% and 35% of customers who will make a purchase after visiting the web site?