Determine whether you can use a normal distribution to approximate the distribution of x, the number of people who reply yes. If you can, find the mean and standard deviation. If you cannot, explain why.

In a survey of 8- to 18-year-old heavy media users in the United States, 47% said they get fair to poor grades (C's or 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.