【GRE考满分题库检索】GRE 题目搜索_数学

科目分类：

全部填空和等价阅读和逻辑数学

书籍分类：

全部图表题专项练习分难度套题练习 GRE数学6000题170逐考点专项练习 GRE数学170超高频“脏”题 GRE数学170超高频“坑”题 GRE数学170超高频“神”题

展开全部

题目列表

题目内容
List A: 1, 5, 9, 13, 4 List B: 1, 5, 9, 13, 9 List C: 1, 5, 9, 13, 7 List D: 1, 5, 9, 13, 6 The standard deviation of n numerical data $$ x_{1}, x_{2}, x_{3}, ..., x_{n}$$, With mean $$\bar{x}$$ is equal to $$\sqrt{\frac{S}{n}}$$, where S is the sum of the squared differences $$(x_{i}-\bar{x})^{2}$$, for 1 ≤ i ≤ n. Which of the following shows lists A, B, C, and D in order from the list with the least standard deviation to the list with the greatest standard deviation?
The standard deviation of the five values 2, 4, 6, 8, 10 is σ. For which of the following lists is the standard deviation of the values in the list equals to σ? Indicate all such lists.
List L consists of an odd number of consecutive integers. The median of the integers in L is 3. Which of the following statements must be true? Indicate all such statements.
The figure shows three circles. A, B, and C, that are tangent to each other. The area of circle A is equal to 1/16 of the area of circle B. The circumference of citele C is equal to the sum of the circumferences of circle A and circle B. If circle C has an area of 100π. what is the radius of circle A? Radius of circle A:__________
Quadrilateral ABCD is inscribed in the circle shown. What is the value of x+y? (Note: The measure of an angle inscribed in a circle is equal to half of the measure of the central angle that subtends the same arc.)
Quantity A The ones digit of $$208^{208}$$ Quantity B 7
If $$\frac{1}{x}$$+$$\frac{1}{y}$$=4.2 and $$\frac{1}{x}$$-$$\frac{1}{y}$$=3.5, what is the value of $$\frac{1}{x^{2}}$$-$$\frac{1}{y^{2}}$$?
If the length of each side of a regular hexagon is 6, what is the area of the regular hexagon?
Working alone at their respective constant rates, an outlet pump can empty a certain tank of water in 7 hours when the tank is initially full, and an inlet pump can fill the tank in 10 hours when the tank is initially empty. Beginning with a full tank, both pumps work simultaneously at their respective constant rates for 1 hour before the inlet pump is shut off. How many more hours would it take the outlet pump working alone to empty the tank?
In the figure, the line l and the x-axis are tangent to the circle at points P and S, respectively, and the line segment QS passed through center R of the circle. What is the slope of l?
The graph shows for each movie category the percent of a sample of middle school students who had watched at least one movie in that category within the last year. If 87 percent of the students in the sample had watched at least one movie in the comedy category and at least one movie in the drama category, what percent of the students in the sample had not watched any movies in either of these two categories?
In square PRSU shown, Q and T are midpoints of sides PR and SU, respectively, and the length of QS is √5. What is the area of quadrilateral PQST? _____
For each set of three distinct nonzero digits, consider the sum of all positive three-digit integers that can be formed by the digits. For example, for the three digits $$1$$, $$2$$, and $$3$$, the sum of all positive three-digit integers that can be formed by the digits is $$123 + 132 + 213 + 231 + 312 + 321 = 1,332$$. How many different integers are equal to such a sum?
In the figure shown, what is the product of the lengths of line segments RU and RT?
$$x \gt y \gt 0$$ Quantity A $$\frac{x}{y}+\frac{y}{x}$$ Quantity B $$2$$
Of the students at a certain university, 40 percent are graduate students, and the rest are undergraduate students. If 15 percent of the graduate students and 30 percent of the undergraduate students are pursuing an engineering degree, what percent of the students pursuing an engineering degree are graduate students?
In the figure shown, WXYZ represents a flat garden with an area of 140 square meters. Edge WX of the garden has length 10 meters, and edge XY has n meters. Quantity A n Quantity B 10
a is an integer. $$2^{a}$$ < 7! Quantity A The greatest possible value of a Quantity B 11
List L consists of positive integers. The median of the integers in L is m. The least integer in L is less than m, and the greatest integer in L is greater than m. Quantity A The number of integers in L that are less than or equal to m Quantity B Twice the number of integers in L that are greater than m
Five children, Alex, Beth, Carl, Dan, and Ellen, stand side by side in a line, in ascending order of height where all five heights are different. Carl is the second tallest and he is taller than Beth but shorter than Dan. Alex has the same number of children standing to his left and to his right, and neither Dan nor Ellen are standing next to Alex. Which of the following shows the five children listed in order from shortest to tallest?