题目信息
| Age | Tax only | Tax and fees | Fees only |
| 18–39 | 20 | 30 | 30 |
| ≥40 | 10 | 60 | 100 |
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that includes a tax, or both?
A:
B:
C:
D:
E:
参考答案及共享解析
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已选答案：
正确答案：
D:
Arithmetic Probability
The requested probability is the number of residents described divided by the total number (250) of residents. The number of residents described is equal to the number of residents of age 18−39 (20 + 30 + 30 = 80) PLUS the number of residents of age ≥ 40 who support tax only (10) PLUS the number of residents of age ≥ 40 who support tax and fees (60). Therefore, the requested probability is
.
Alternatively, the requested probability is 1 minus the number of residents NOT described (100) divided by 250, or
.
The correct answer is D.
The requested probability is the number of residents described divided by the total number (250) of residents. The number of residents described is equal to the number of residents of age 18−39 (20 + 30 + 30 = 80) PLUS the number of residents of age ≥ 40 who support tax only (10) PLUS the number of residents of age ≥ 40 who support tax and fees (60). Therefore, the requested probability is
.Alternatively, the requested probability is 1 minus the number of residents NOT described (100) divided by 250, or
.The correct answer is D.
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