How does level of affluence affect health care? To study this problem, a group of heart attack victims was selected. Each was categorized as a low, medium, or high-income earner. Each was also categorized as having survived or died.

A demographer notes that at the national level, 23% individuals fall into the low-income group, 46% are in the medium-income group, and 31% are in the high-income group. Furthermore, an analysis of heart attack victims reveals that 13% of low-income people, 8% of medium-income people, and 9% of high-income people die of heart attacks.

Draw a probability tree to depict this problem (attach it to your PDF solution) and find the probability that a survivor of a heart attack is in the high-income group.