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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

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 50 are selected.

What is the probability that the sample proportion will have between 20% and 30% of customers who will make a purchase after visiting the web site?

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