The back cover of a popular diet book claims that 72% of the people who followed its dietary recommendations, according to reader feedback, had lost at least 5 pounds in the first week. Out of interest you contact the publisher, who is happy to show you the letters that have been received from the readers. There are 246 letters praising the diet, and saying the writers have lost weights of 5 pounds or more within a week. There are 96 letters from people asking for their money back, because they actually gained weight in the first week. a. What do you think of the publisher's claim? b. Based on reader feedback, it appears to be true that 72% of these readers lost at least 5 pounds in the first week. What do you think is the catch in this number?