An online bookseller is considering selling an ereader but will only do so if they have evidence

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An online bookseller is considering selling an ereader but will only do so if they have evidence that the proportion of customers that will likely purchase one is at least 0.4. Based on a survey of 25 customers, it was found that 8 of them stated that they would likely purchase an e reader. What should the book seller do?

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