The Genesis Diving Institute of Florida certifies scuba divers using a variety of different systems of education. This organization recently studied the time spent underwater by scuba divers exploring...

The Genesis Diving Institute of Florida certifies scuba divers using a variety of different systems of education. This organization recently studied the time spent underwater by scuba divers exploring caves and in open water. Each diver was also classified by age group. Independent dives were selected at random for each combination of age group and dive type. The data (in minutes) are given in the following table.