20. TV Advertising Charges for advertising on a TV show are based on the number of viewers, which is measured by the rating. The rating is a percentage of the population of 110 million TV households. The CBS television show 60 Minutes recently had a rating of 7.8, indicating that 7.8% of the households were tuned to that show. An advertiser conducts an independent survey of 100 households and finds that only 4 were tuned to 60 Minutes. Assuming that the 7.8 rating is correct, find the probability of surveying 100 randomly selected households and getting 4 or fewer tuned to 60 Minutes. Does the 300 Chapter 6 Normal Probability Distributions result suggest that the rating of 7.8 is too high? Does the advertiser have grounds for claiming a refund on the basis that the size of the audience was exaggerated?