Which of the following is inappropriate in citing the statistics? A: Joan's family has 5 children, 11 cats, 3 turtles, 15 gerbils, and 2 canaries. B: About half of the middle school students own a smart phone. C: Our research indicates that only 33% of people like purple cars. D: The class did well on its first exam, with a mean score of 89.5% and a standard deviation of 7.8%.