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题目内容
For 1995, which of the following ratios is closest to the ratio of the average cost of tuition and fees for students in private colleges in the United States to the corresponding average cost for students in public colleges?
In 1995, the average cost for tuition and fees for students attending four-year private colleges in the United States was $$6$$ percent higher than the corresponding average cost in 1994. Which of the following is closest to the 1994 average cost?
Approximately how many of the employees in the 2001 workforce were hired prior to 1994?
Approximately what fraction of the employees in the 2001 workforce was hired in 1998, 1999, or 2000?
Two employees will be randomly selected from the 2001 workforce. Which of the following is closest to the probability that both employees selected will be employees who were hired in 1997?


$$P$$, $$Q$$, and $$R$$ represent Paula, Quincy, and Robert, respectively. The table shows the average annual income for 2004 for different subgroups of these three people. What is the value of $$x$$?
The arithmetic mean and standard deviation of a list of numbers are $$10.8$$ and $$0$$.

Quantity A

The range of the numbers in the list

Quantity B

$$0$$
The random variable $$W$$ is normally distributed with $$P(W\lt k)<0.6$$ and $$P(W \gt n)<0.1$$, where $$k$$ and $$n$$ are constants.

Quantity A

$$P(k\lt W\lt n)$$

Quantity B

$$0.3$$
A box contains $$10$$ red balls, $$5$$ blue balls, and no other balls. Ann will randomly select, without replacement, $$2$$ balls from the box.

Quantity A

The probability that Ann will select $$2$$ red balls

Quantity B

$$\frac{3}{7}$$

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