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题目内容
In a list of 5 different numbers the average (arithmetic mean) of the 3 greatest numbers is 72 more than the average of the 3 least nunbers. The average of the 2 greatest numbers is how much more than the average of the 2 least numbers?
In a number set of A and B, the probability that the number in Set A which are greater than 50 is equal to the probability that the number in Set B which are greater than 55.

Quantity A

The average of Set A

Quantity B

The average of Set B
The average of a list containing 55 numbers is x. If a number k is removed from the list, the new average is x-1. What is the value of k in terms of x?
The average weight of a pair of parents is 240 pounds more than the average weight of their 4 kids. If the average of the entire family is 140, what is the average weight of 4 kids?
If a kid sits an exam for 10 times (the full score of the exam is 100), but only gets an average score of 75, then how many more times does he need to sit the exam and get a score of 100 each time, such that his average score will reach 90?
The sale price of a pen and a pencil is $2 and $1.5, respectively. Which of the following statement could determine the average sold price?
Indicate all such statements.
The average weight of 7 fish is 25 pounds. Among them, the 4 heaviest weigh 117 pounds in total, the average of the 4 lightest weigh 20.5 pounds. What`s the median weight of the 7 fish? pounds
$$x \lt y$$

The median of $$x$$, $$y$$ and $$120$$ is $$100$$

Quantity A

$$x$$

Quantity B

$$90$$
All the angles in a regular n-sided polygon and a (n+1)-sided regular polygon are included in a list.

Quantity A

The median of the list of angles

Quantity B

90°
The median of 5 integers is 60, with each of the remaining 4 numbers between 50 and 70, inclusive. Which of the following could be the sum of the 5 integers?
There are 15 numbers in List M, in which 8 numbers are greater than 50.4, and 8 numbers are less than 54.6.

Quantity A

The median of the numbers in List M

Quantity B

52.5
a < b < c < d

Quantity A

$$\frac{a+b}{2}$$

Quantity B

The median of four numbers
If the median of seven consecutive even integers is 2n+2, then what is the average of them?
In a certain sequence of 90, 105, x, 120 and 125, both the mean and the median are equal to x. What is the value of x?
The average (arithmetic mean) of a set of 10 positive integers is 7.5.

Quantity A

The probability that the value of one randomly chosen integer from the set will be greater than 7

Quantity B

$$\frac{1}{2}$$
The range of 7 integers is 4, and the median of the 7 integers is m. The greatest number less than the median is m-3.

Quantity A

The mean of the 7 integers

Quantity B

m
The stock prices of three companies are $$x$$, $$2x$$ and $$x+2$$, respectively and $$x \gt 2$$. Which of the following statement alone can be sufficient to determine the value of $$x$$?
Indicate all such statements.
List R and List S both have 100 numbers, among which 50 are overlapping. The mean of List R is smaller than the mean of List S.

Quantity A

The median of List R

Quantity B

The median of List S
7, 11, 15, 19, 23, x, y The average of the above 7 positive integers is 13. Which of the following could be the median of the 7 numbers?
Indicate all such numbers.
Set A consists of 5 numbers. The median of the 5 numbers is m, the difference between m and the maximum number is 6, while the difference between m and the minimum is 2.

Quantity A

m

Quantity B

The average of the 5 numbers

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