Nutz and Boltz, Inc. employs 100 people; 80 are lawyers and 20 are engineers. Albert, a lawyer at the company, is quiet, likes puzzles, and carries a calculator. Most people, when asked whether Albert is a lawyer or an engineer, will guess that he is an engineer. These people are using ________ to make this faulty guess. A correct guess would have been made if they had used ________.