G. With recent growth in the number of U.S. households wired for cable television, major advertisers are now beginning to show an increased interest in cable advertising. Since its inception, cable television has offered advertisers relatively inexpensive rates and selective target audiences. For purposes of comparison, A.J. Bush and J.H. Leigh conducted a content analysis of television commercials on three major networks, ABC, CBS and NBC, and three of the more popular well established cable networks, CNN, ESPN and TBS. Once of the variables measured was the number of advertisements shown during prime time (7:00-10:00) and late night (10:00- 12:00A.A.M.) viewing segments on two weekday evenings during November 2003. The results are summarized in the table below. Prime-Time Late-Night Totals MAJOR NETWORKS ABC CBS NBC 94 90 86 69 84 94 163 174 180 CABLE NETWORKS TBS CNN ESPN 66 95 87 47 60 45 113 155 132 TOTALS 518 399 917 Suppose an advertisement is selected at random from advertisements shown on the two weekday evenings during November 2003. What is the probability that the advertisement selected: Prime-Time Late-Night Totals MAJOR NETWORKS ABC CBS NBC 94 90 86 69 84 94 163 174 180 CABLE NETWORKS TBS CNN ESPN 66 95 87 47 60 45 113 155 132 TOTALS 518 399 917 Solution Now this one is... [P(ABC and Late-Night) + P(CBS and Prime-Time)] / Total = (69 + 90) / 917 = .1734 or 17.34%.