Question

In a population of interest, we know that, 77% drink coffee, and 23% drink tea. Assume that drinking coffee and tea are disjoint events in this population. We also know coffee drinkers have a 30% chance of smoking. There is a 13% chance of smoking for those who drink tea.

Five individuals are randomly chosen from this population. What is the expected number (population mean) of coffee drinkers?

Answer 1