Due to the advent of tablets, American adults are watching significantly less television than they did in previous decades. In 2016, Nielsen reported that American adults are watching an average of five hours and four minutes, or 304 minutes, of television per day.

a. Find the probability that an average American adult watches more than 320 minutes of television per day.

b. Find the probability that an average American adult watches more than 2,200 minutes of television per week.