Tobacco Alcohol Use in Children’s Movies In “Tobacco and Alcohol Use in GRated Children’s Animated Films,” by Goldstein, Sobel, and Newman (Journal of the American Medical Association, Vol. 281, No. 12), the lengths (in seconds) of scenes showing tobacco use and alcohol use were recorded for animated children’s movies.

Refer to Data Set 7 in Appendix B and find the mean and median for the tobacco times, then find the mean and median for the alcohol times. Does there appear to be a difference between those times? Which appears to be the larger problem: scenes showing tobacco use or scenes showing alcohol use?

In Exercises 17–20, find the mean of the data summarized in the given frequency distribution.