1. A survey was conducted in the United States and 10 countries of Western Europe to determine the percentage of teenagers who had used marijuana and other drugs. The results are summarized in the following table.

Percent Who Have Used Country Marijuana Other Drugs Czech Rep. 22 Denmark 17 England 40 21 Finland 5 Ireland 37 16 Italy 19 No. Ireland 23 14 Norway Portugal Scotland 53 United States 34 24