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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?
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
Let $$S_8$$ represents the set of integers from $$1$$ to $$8$$, and let $$S_9$$ represents the set of integers from $$1$$ to $$9$$.

Quantity A

The number of the subsets of $$S_8$$

Quantity B

The number of the subsets of $$S_9$$ that contain the integer $$9$$


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.
________%
Of the 66 guests at a certain hotel, 40 guests enjoy dancing and 25 guests enjoy swimming. If all but 6 of the guests enjoy dancing or swimming or both, how many guests enjoy 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?
There are 20,000 people in club A and 30,000 people in club B. There are 45,000 members who are in at least one club. If you choose one member from club A, what's the probability that this member is also in club B? Give your answer as a fraction.
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.
______%

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