Question 4.81

4.81 Preparing for the GMAT.

A company that offers courses to prepare would-be MBA students for the GMAT examination finds that 40% of its customers are currently undergraduate students and 60% are college graduates. After completing the course, 50% of the undergraduates and 70% of the graduates achieve scores of at least 600 on the GMAT. Use a tree diagram to organize this information.

  1. What percent of customers are undergraduates and score at least 600? What percent of customers are graduates and score at least 600?
  2. What percent of all customers score at least 600 on the GMAT?

4.81

(a) For undergraduates: 0.2. For graduates: 0.42. (b) 0.62.