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题目内容
In the xy-plane, there are ten points on line y=0.8x-4.5, the range of y is 5, what is the range of x?
During the 2nd month to the 4th month, each month`s sales are 50 more than the former month. And during the 5th month to the 7th month, each month`s sales are 100 fewer than the former month. Then what is the range of sales between the 1st month and the 7th month?
The median of 5 different integers is 60,and the rest integers are between 50 and 70,inclusive. What is the range of all the possible sum of the 5 integers?
Among a group of 120 people in total, the range is 120. Yet, among 90 people inside the group, the range of is 90.

Quantity A

The range of the rest 30 people among them

Quantity B

30
A student attended 3 tests with every score is an integer between 0 and 100（inclusive）, and the average score of the 3 scores is 75. What is the greatest possible range between the3 scores？
In the distribution of X, the mean is 10, and the standard deviation is 0.6;in the distribution of Y, the mean is12,and the standard deviation is 0.7.

Quantity A

The standard deviation of X when all the numbers in X increase by 3

Quantity B

The standard deviation of y when all the numbers in Y increase by 2
Set A={-8,-3,5,7,15}
Set B={-3,2,10,12,20]
Quantity A: The standard deviation of numbers in set A
Quantity B: The standard deviation of numbers in set B

Quantity A

The standard deviation of 1, 11, 111

Quantity B

The standard deviation of 2, 22, 222
Set A= {0.2,0.4,0.6,0.8}
Set B= {1,2,3,4}
Quantity A: The standard deviation of numbers in Set A
Quantity B: The standard deviation of numbers in Set A
The standard deviation of four numbers a, b, c, d is M, then the standard deviation of which of the following MUST be M?
Indicate all such variations.
If the standard deviation of a,b,c,d is 1,what is the standard deviation of a+1,b+1,c+1,d+1?
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?
Each employee in two separate groups of 15 employees, group I and group II, was given a job-performance rating. The standard deviation of the ratings for group I was 8.5 and the standard deviation for group II was also 8.5.

Quantity A

The standard deviation of the 30 ratingss

Quantity B

17
What is the value of a to make the standard deviation of 1, a and 7 the least?
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
Data x has a distribution with a standard deviation of 5, while data y has a distribution with a standard deviation of 10.

Quantity A

The value of x which is one standard deviation above the mean

Quantity B

The value of y which is two standard deviations above the mean
The average temperature is 70 °, and the standard deviation is 6.5 °. Which of the following is within a standard deviation of the mean?
Indicate all such measure
In a number list with a mean of 6.0 and standard deviation of 1.5,the value A is one standard deviation above the mean.

Quantity A

A

Quantity B

7.2
A set of data are normally distributed with a mean of 500 and a standard deviation of 100. If there are 10,200 data between 500 and 600 inclusive, then how many figures in the data are less than 400?
In a survey of 5,500 respondents over how many books they would read per year on average, the result is normally distributed, with a mean of 19 and a standard deviation of 2. What is the average number of books read by the 880 respondents whose number of books read per year is the greatest?

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