Describe what is meant by disjoint sets.
Two sets and are disjointed if they don't have any common elements, meaning their intersection is empty.
Seat Belt Effectiveness A federal study showed that of occupants involved in a fatal car crash wore seat belts. Of those in a fatal crash who wore seat belts, were ejected from the vehicle. For those not wearing seat belts, were ejected from the vehicle. Source: National Highway Traffic Safety Administration.
a. Find the probability that a randomly selected person in a fatal car crash who was ejected from the vehicle was wearing a seat belt.
b. Find the probability that a randomly selected person in a fatal car crash who was not ejected from the vehicle was not wearing a seat belt.
Circulation The probability that a randomly chosen male has a circulation problem is . Males who have a circulation problem are twice as likely to be smokers as those who do not have a circulation problem. What is the conditional probability that a male has a circulation problem, given that he is a smoker? Choose one of the following. Source: Society of Actuaries.