If one person is selected at random from this group, what is the probability that the person is in the 18-40 age group…

The correct answer is A. The probability of a specific event is the number of favorable outcomes divided by the total number of possible outcomes. According to the table, the number of people in the 18-40 age group who prefer email is 50. The total number of people surveyed is 240.

Therefore, the probability that a randomly selected person is in the 18-40 age group and prefers email is 50/240. This fraction simplifies to 5/24.

B is incorrect because 5/12 is the result of dividing the number of people in the 18-40 age group who prefer email (50) by the total number of people in the 18-40 age group (120). This represents the probability that a person prefers email GIVEN that they are in the 18-40 age group, not the probability of both conditions being true out of the entire group. C is incorrect because 1/2 is the result of dividing the total number of people in the 18-40 age group (120) by the total number of people surveyed (240). This is the probability of selecting a person from the 18-40 age group, regardless of their preference. D is incorrect because 13/24 is the result of dividing the total number of people who prefer email (130) by the total number of people surveyed (240). This is the probability of selecting a person who prefers email, regardless of their age group.