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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
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Quantity A

The standard deviation of 1, 1 and 11

Quantity B

The standard deviation of 2, 2 and 22

Quantity A

The standard deviation of 1, 11 and 111

Quantity B

The standard deviation of 2, 22 and 222
Set A={0.2,0.4,0.6,0.8}
Set B={1,2,3,4}

Quantity A

The standard deviation of integers in Set A

Quantity B

The standard deviation of integers in Set B
Sample P: 0.8, 0.9, 0.9, 1.0

Sample Q: 1.0, 1.0, 1.0, 1.0

Sample R: 0.8, 0.8, 1.0, 1.0

Sample S: 0.7, 0.7, 0.9, 0.9

Sample T: 0.9, 1.0, 1.0, 1.1

Five samples of 4 washers each were taken from a production line. The inside diameter of each washer was recorded to the nearest 0.1 centimeter, as shown above. For which of the samples is the standard deviation of the measurements greater than the standard deviation of the measurements for sample P?

Indicate all such samples.
Each of the following linear equations defines y as a function of x for all integers x from 1 to 100. For which of the following equations is the standard deviation of the y-values corresponding to all the x-values the greatest?
20 numbers ranging from 0 to 1 are included in Set Q. Set R also has 20 numbers inside and is composed in a way as follows:
If any number X in Set Q is less than $$\frac{1}{2}$$, then X is also included in Set R;
If any number X in Set Q equals to or is more than $$\frac{1}{2}$$, then (2X-1) is also included in Set R

Quantity A

The standard deviation of all the numbers in Set Q

Quantity B

The standard deviation of all the numbers in Set R
A list of numbers from 20 to 40 has a standard deviation of x. By which of the following methods will the standard deviation decrease the most?
Someone needs to import a number of sets of bottles. Each bottle charges $12.04, and it also charges $4.8 for shipping each set (not single bottle but a whole set). The standard deviation of numbers of bottles in each set is 1.5. What is the standard deviation of the prices for each set?
Give your answer as a decimal.

Quantity A

The standard deviation of 11, 22 and 33

Quantity B

The standard deviation of 111, 222 and 333
$$n \gt 2$$

List M=$${2, n, n, n}$$

List N=$${2, 2, 2, n}$$

Quantity A

The standard deviation of List M

Quantity B

The standard deviation of List N

The preceding frequency distributions represent two groups of data. Each of the data values is a multiple of 10.

Quantity A

The standard deviation of distribution C

Quantity B

The standard deviation of distribution D
Set A={3, 5, 7, 8, 8, 9, 10, 11, 12}
Set B={3, 5, 7, 9, 10, 11, 12}

Quantity A

The standard deviation of all the numbers in Set A

Quantity B

The standard deviation of all the numbers in Set B
For what value of $$a$$ does the standard deviation of the numbers $$a$$, 1, 7 have the least value?
A set of numbers include 4, 6, 12, 14, X
X must be which of the following integer so that the standard deviation of the set of is the lowest?
Set A={500, 600, 700, 900, 1200}
Set B={500, 600, 800, 900, 1200}

Quantity A

The standard deviation of all the numbers in Set A

Quantity B

The standard deviation of all the numbers in Set B
If x is the standard deviation of a, b, c, d, e, and y is the standard deviation of a-3, b-2, c, d+2, e+3.

Quantity A

x

Quantity B

y

Quantity A

The standard deviation of a, b, c, d and e

Quantity B

The standard deviation of a+1, b, c, d and e-1
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, what is the value of x?
For a certain distribution, the measurement 12.1 is 1.5 standard deviations below the mean, and the measurement 17.5 is 3.0 deviations above the mean. What is the mean of the of distribution?
The distribution of the numbers of hours that students at a certain college studied for final exams has a mean of 12 hours and a standard deviation of 3 hours. Which of the following numbers of hours are within 2 standard deviations of the mean of the distribution?
Indicate all such numbers

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