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.
4.81
(a) For undergraduates: 0.2. For graduates: 0.42. (b) 0.62.