Question live-e
| Live east of the river | Live west of the river | Total | |
|---|---|---|---|
| Less than years old | |||
| At least years old | |||
| Total |
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 years old?
Live east of the river Live west of the river Total Less than 40 years old
Medium-difficulty · SAT Math · Probability & Conditional Probability — Simple probability. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. If a member of the organization is selected at random, the probability that the selected member is at least years old is equal to the number of members who are at least years old divided by the total number of members. According to the table, there are a total of members of the organization, and of these members are at least years old. Therefore, the probability that the selected member is at least years old is .
Choice A is incorrect. This is the probability that the selected member is less than 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.
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