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题目内容
A box contains 6 cards, numbered 1, 2, 3, 4, 5, and 6, respectively. If one of the 6 cards is to be selected at random, what is the probability that the number on the card selected will be greater than 3 or even or both?
-3 < x < 7

Quantity A

x-2

Quantity B

6
At a certain sale, the price of a jacket was reduced by 5 percent and the price of a pair of slacks was reduced by 20 percent.

Quantity A

The dollar reduction in the price of the jacket

Quantity B

The dollar reduction in the price of the pair of slacks

Quantity A

The product of the positive prime factors of 30

Quantity B

The sum of the positive prime factors of 30
$$(3^{x})(3^{y})$$=1

Quantity A

x+y

Quantity B

1


Quantity A

x

Quantity B

y
s and t are positive integers such that st=30.

Quantity A

The least possible value of s+t

Quantity B

13


The figure shows the standard normal distribution, with mean 0 and standard deviation 1, including approximate probabilities corresponding to the six intervals shown.

The random variable X is normally distributed with mean 140 and standard deviation 12.

Quantity A

P(125 < X < 131)

Quantity B

P(152 < X < 158)
Last month Paul and Jack each sold newspaper and Paul sold 5,000 more newspaper than Jack. If Paul and Jack sold a combined total of 35,000 newspaper last month, what fraction of this combined total did Jack sell?
A shop sells only two types of beverages: coffee and teas. If 36 percent of the shop`s beverages are teas that have caffeine and 60 percent of the shop`s teas have caffeine, what percent of the shop`s beverages are coffees?
List L consists of the integers from 1 to 99 and two integers c and d such that c+d=100 and cd < 0. Which of the following statements must be true?

Indicate all such statements.
Among the incoming students at a certain college, an equal number of full-time and part-time students received a welcome package. If $$\frac{3}{16}$$ of the incoming full-time students and $$\frac{5}{12}$$ of the incoming part-time students received a welcome package, what fraction of the incoming students received a welcome package?
A circle in the xy-plane is given by the equation $$(x-a)^2+(y-b)^2=c^2$$, where a, b, and c are nonzero constants. If the point $$(b+a, b-a)$$ lies on the circle, which of the following is an equation of the tangent line to the circle at this point?
If the range of the average daily electric use for the months from January to June in 2015 was x kilowatt-hours less than that for the months from July to December in 2015 and if the range of the average daily electric use for the months from January to June in 2016 was y kilowatt-hours less than that for the months from July to December in 2016, approximately what is the value of x-y?
The total electric use, in kilowatt-hours, for the 31 days in March, the 30 days in April, and the 31 days in May was approximately how much greater for 2016 than for 2015?
What is the ratio of the number of months for which the percent increase from 2015 to 2016 in the average daily electric use was greater than 28 percent to the number of months for which the percent increase from 2015 to 2016 in the average daily electric use was greater than 10 percent?

Give your answer as a fraction.
The standard deviation of n numbers $$x_{1}$$, $$x_{2}$$, $$x_{3}$$,......, $$x_{n}$$, with mean x is equal to $$\sqrt{\frac{s}{n}}$$, where S is the sum of the squared differences, $$(x_{i}- x)^{2}$$ for 1 ≤ i ≤ n.

If the standard deviation of the 4 numbers 140-a, 140, 160, and 160+a is 50, where a > 0, what is the value of a?
In sequence T, each term after the first term is d more than the preceding term. The sum of the first 10 terms of T is 210. The sum of the first 20 terms of T is 820. What is the value of d?
In two equilateral parallelograms, X and Y, the sum of the lengths of the diagonals of X is equal to the sum of the lengths of the diagonals of Y. In X, the length of the longer diagonal is 20 more than the length of the shorter diagonal. In Y, the length of the longer diagonal is 8 more than the length of the shorter diagonal. What is the area of Y minus the area of X?
1, 2, 2, 3, 3, 3, 4, 4, 4, 4, ......, 24

The list above consists of 300 entries that are integers in increasing order, and each integer n occurs n times for 1 ≤ n ≤ 24. What is the least integer k in the list for which at least 15% of all the entries are less than k?

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