Live east Live west of the river of the river Total Less than 17 11 28 40 years old At least 18 89 107 40 years old Total 35 100 135 The table summarizes members of a local organization by age and whether they live east or west of the river. If a member of the organization is selected at random, what is the probability that the selected member is at least 40 years old?
Correct answer: D (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice D is correct. If a member of the organization is selected at random, the 40 probability that the selected member is at least years old is equal to the 40 number of members who are at least years old divided by the total number of 135 members. According to the table, there are a total of members of the 107 40 organization, and of these members are at least years old. Therefore, the 40 107 probability that the selected member is at least years old is 135. Choice A is incorrect. This is the probability that the selected member is less than 40 years old. Choice B is incorrect. This is the probability that the selected member lives east of the river. Choice C is incorrect. This is the probability that the selected member lives west of the river. 40 SAT PRACTICE TEST #9 ANSWER EXPLANATIONS SAT ANSWER EXPLANATIONS n MATH: MODULE 2
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