#### 题目列表

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.

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?
The measurement of X is normally distributed with a mean of 60 and standard deviation of 30.
Quantity A: The probability when 45 < x < 60
Quantity B: The probability when x > 95
Set A={1, 2, 3, 4, 5, 6, 7, 8)
Set B={1, 2, 3, 4, 5, 6, 7, 8, 9}

#### Quantity A

The number of the subsets of set A

#### Quantity B

The number of the subsets of set B

In a survey between staffs, 40% of the staffs chose only company A, 20% of the staffs chose only company B, 15% of the staffs chose both A and B, what percent of staffs chose neither A nor B? Give your answer as a percent.
________%
Among 66 people,40 people like dancing,and 25 people like swimming. if all but 6 people like dancing or swimming or both,then how many people like dancing but not swimming?
40 people join club X, 28 people join club Y, and 8 people join both club X and club Y. How many people join at least one club of the two clubs?
70 people choose A, or B, or both. Among them 53 choose A and 48 choose B, then how many people choose both?
75% of a group of students grades are greater than 70, and 60% of students grades are less than 85, what percent of students scores are between 70 and 85? Give your answer as a percent.
______%
When testing a series of bottles of water, chemical A is found in 52% of all bottles, chemical B is found in 18% of all bottles, while chemical A and B are found in 10% of all bottles.

#### Quantity A

The proportion of bottles that contain neither chemical A nor chemical B

#### Quantity B

34%

There are 30 students in the class. 17 of them join the music club, and 15 of them join the science club. If everyone must join at least one club, then whats the number of students who join both clubs?
If 2/3 of employees are working on project A, and 1/5 of the rest of the employees are working on project B. What is the ratio of employees who neither work on project A nor work on project B?

The 50 students in an art class were given an assignment to visit two museums, A and B. During the week after the assignment was given, 25 of the students visited Museum A and 10 of those 25 students also visited Museum B.

Which of the following statements individually provide(s) sufficient additional information to determine how many of the students visited Museum B during that week?

Indicate all such statements.
In a certain class,40% take A,40% take B,20% take A and B,what percent of students take neither A nor B?
______%
There are 80 students in a class. 40 of them choose biology, and 30 of them choose chemistry. Which of the following can independently identify the number of students who choose both biology and chemistry?
Indicate all such statements.
Of the 1,000 people, there are 300 people who are 40 years old or older, and 320 women who are younger than 40 years old. What is the number of men younger than 40 years old?
In a sample of n people, 80 percent of the people filled out a questionnaire. If 65 percent of those who filled out the questionnaire are college graduates, what is the greatest possible percent of college graduates in the sample of n people?
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