Most dial-up Internet service providers (ISPs) attempt to provide a large enough service so that customers seldom

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Most dial-up Internet service providers (ISPs) attempt to provide a large enough service so that customers seldom encounter a busy signal. Suppose that the customers of one ISP encounter busy signals 8% of the time. During the week, a customer of this ISP called 25 times. What is the probability that she did not encounter any busy signals?

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