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GRE数学
19.A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10. Quantity A Quantity B The probability of the...
18.The range of the heights of the female students in a certain class is 13.2 inches, and the range of the heights of the male students in the c...
17.Let S be the set of all positive integers n such that n2 is a multiple of both 24 and 108. Which of the following integers are divisors of e...
15.If 1+x+x^2+x^3=60, then the average (arithmetic mean) of x, x^2, x^3, and x^4 is equal to which of the following? A 12x B 15x C 20x D...
12.Line k lies in the xy-plane. The x-intercept of line k is –4, and line k passes through the midpoint of the line segment whose endpoints are ...
11.Of the 700 members of a certain organization, 120 are lawyers. Two members of the organization will be selected at random. Which of the following...
10.By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of soluti...
8.Frequency Distribution for List X Number 1 2 3 5 Frequency 10 20 18 12 Frequency Distribution for List Y Number 6 7 8 9 Frequency 24 1...
7.A list of numbers has a mean of 8 and a standard deviation of 2.5. If x is a number in the list that is 2 standard deviations above the mean...
6.A certain store sells two types of pens: one type for $2 per pen and the other type for $3 per pen. If a customer can spend up to $25 to bu...
1)If the dollar amount of sales at Store P was $800,000 for 2006, what was the dollar amount of sales at that store for 2008 ? A $727,200 B...
4.Working alone at its constant rate, machine A produces k car parts in 10 minutes. Working alone at its constant rate, machine B produces k car p...
3.Each employee of a certain company is in either Department X or Department Y, and there are more than twice as many employees in Department X as...
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