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题目内容
List A consists of n integers and list B consists of k integers. The average (arithmetic mean) of the integers in list A is less than the average of the integers in list B. The sum of the integers in list A is 524 and the sum of the integers in list B is 565.

Quantity A

n

Quantity B

k
List K consists of 100 numbers between 20 and 40, and list M consists of 200 numbers between 30 and 50.

Quantity A:The arithmetic mean of the members in list K

Quantity B:The arithmetic mean of the members in list M
R:x,y,z,2.7,3.8,5.5

S:x,y,z,-2.7,-3.8,-5.5

If the average (arithmetic mean) of the 6 numbers in list R is r and the average of the 6 numbers in list S is s, then r-s is the average of which of the following lists?
List S: a, b, c

List T: 3a+1, 3b+1, 3c+1

If the average of all the numbers in list S is m, what is the average of all the numbers in list T?
30% of all alumni donate money to a university, while the average donation is $1,350 per donator.

Quantity A

The average donation for all the alumni

Quantity B

450
List G consists of positive integers, each of which is less than or equal to 300. The average (arithmetic mean) of the integers in G is greater than 25c, where c is a positive number.

Quantity A

c

Quantity B

13
5 collectors have some rare collection,then comes the $$6^{th}$$ collector with 50 pieces of collection,and then the average piece of collection is 5 more than the average before. Then comes the $$7^{th}$$ collector with some collection,and the average is 5 more than the average of the first 6 collectors. How many pieces of collection does the $$7^{th}$$ collector have?
List L consists of n values, and the average (arithmetic mean) of the values in L is 10. List M consists of r values, and the average of the values in M is 15. The average of the values in List L and M combined is 11. If r > 100, which of the following could be the value of n?

Indicate all such values.
List A include five numbers: x, x+1, x+1, x+1, x+2

List B can be achieved by adding 3 times the range of List A to each data in List A.

The average of all the numbers in List B is how much higher than that of List A?
Each digit of a 20-digit number is either a 1, 2, 3, 4, or 5. If the average (arithmetic mean) of 15 of the 20 digits of the number is 2.8 and if M is the average of all 20 digits of the number, then M must satisfy which of the following inequalities?
In a competition, a certain contestant scored either 2 points or 4 points in each round of the competition. This contestant`s average (arithmetic mean) score for the entire competition was 3.8 points per round.

Quantity A

9 times the number of rounds in which the contestant scored 2 points

Quantity B

The number of rounds in which the contestant scored 4 points

Quantity A

The median of 2, 5, 7, 10, x, x+4

Quantity B

The median of 1, 2, 3, 5, 6, 7, 8, 9
2$$\sqrt{2}$$-1, $$\sqrt{2}$$-1, 1+$$\sqrt{2}$$, 1- $$\sqrt{2}$$, $$\sqrt{2}$$

What is the median of the numbers shown?
If the average (arithmetic mean) of the list of positive integers 2, x, y and 7 is 3, then the median of the list of integers is?
List S consists of 19 numbers, and the median of the numbers in S is 8. List T consists of the numbers in S and the number 7, Which of the following numbers could be the median of T?

Indicate all such numbers.
y < x

y=rs

z=rxy

If r, s, x, y and z are positive even integers that are related by the system shown, what is the median of the integers r, s, x, y and z?
Quantity A:The median number of days per month for a year in which February has 28 days

Quantity B:The median number of days per month for a year in which February has 29 days
Twenty-five out of $$48$$ employees salaries of Business $$Y$$ are less than $38,500 per year.

Quantity A

The median salary for the $$48$$ employees at Business $$Y$$

Quantity B

$38,000


The table above shows a certain store`s weekly revenue and expenses for five weeks. What is the store`s median weekly profit for the five weeks?
Mr. Thomas gave a chemistry test to 25 students and assigned each student a score. Of the 25 students, 12 students received scores that were greater than 80.

Which of the following statements individually provide(s) sufficient additional information to determine the median of the 25 scores?

Indicate all such statements.

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