In a survey of 8-to 18-year-old heavy media users in the United States, 47% said they get

Question:

In a survey of 8-to 18-year-old heavy media users in the United States, 47% said they get fair or poor grades (C and below). You randomly select forty-five 8- to 18-year-old heavy media users in the United States and ask them whether they get fair or poor grades. What is the probability that fewer than 20 of them respond yes?

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