#### 题目列表

For the frequency distribution of the variable x shown in the table above, what is the median value of x? What is the range of all the weekly rental rates in the table?
A group of 10 couples plans to rent bayside summer houses on Island X from Realtor M for a certain week. The total rental cost for the houses will be evenly distributed among the 10 couples, and each couple will have their own bedroom. If Realtor M has at least three bayside summer houses of each type available that week, what is the least possible rental cost per couple?
If Realtor Ms inland summer houses on Island X generate a total weekly rental income of \$8,800 when they are all rented, what is the greatest possible number of inland 4-bedroom summer houses that Realtor M can have?
From 1989 to 1992, there was a 10 percent increase in the percent of families that owned directly held stocks. Which of the following is closest to the percent of families who owned directly held stocks in 1989?
If 38.7 percent of the families who owned a home owed money on a home mortgage loan or home equity loan, or both, approximately what percent of United States families owned homes free of both home mortgage and home equity loans?
If 250 employees in administration were transferred from Site II to Site I and no other changes in employment occurred, approximately what percent of the employees at Site I would work in administration?
The ratio of the number of production workers at Site I to the number of production workers at Site II is mostly equal to
At Site II, if the average (arithmetic mean) salaries in production, administration, and research are x, y, and z dollars, respectively, what is the average salary, in dollars, of all employees at Site II?
The total number of vehicles sold in Region X by companies other than A, B, C and D in 2009 was approximately how much less than that in 2006?
For which of the last five years shown was the difference between the annual number of vehicles sold by Company C and the annual number of vehicles sold by Company D least?
The increase in the number of vehicles sold in Region X from 2002 to 2003 was the same was that from 2003 to 2004. The decrease in the number of vehicles sold in Region X from 2009 to 2010 was the same as that from 2008 to 2009. For the years from 2002 to 2010, the median number of vehicles sold annually was approximately how much greater than the average (arithmetic mean) number of vehicles sold annually?

The table above shows a certain stores weekly revenue and expenses for five weeks. What is the store`s median weekly profit for the five weeks? #### Quantity A

The standard deviation of the numbers 45, 64, 83, and 53

#### Quantity B

The standard deviation of the numbers 55, 81, 47, and 62

The random variable X has the standard normal distribution with a mean of 0 and a standard deviation of 1, as shown. Probabilities, rounded to the nearest 0.01, are indicated for the six intervals shown. The random variable Y has a normal distribution with a mean of 2 and a standard deviation of 1. Using the probabilities shown, approximately how much greater is the probability that the value of Y is between 1 and 2 than the probability that the value of X is between 1 and 2? The figure above shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.

The lengths of phone calls made on a certain weekend by students at High School H are approximately normally distributed with a mean of 30 minutes and a standard deviation of 10 minutes. Which of the following statements must be true?

Indicate all such statements. $a_1$, $a_2$, $a_3$,......,$a_{150}$

The $n_{th}$ term if the sequence shown is defined for each integer n from 1 to 150 as follows. If n is odd, then $a_n$=$\frac{(n+1)}{2}$, and if n is even, then $a_{n}$=$(a_{n-1})^{2}$. How many integers appear in the sequence twice?
If an integer is chosen at random from the integers between 101 and 550, inclusive, what is the probability that the chosen integer will begin with the digit 1, 2 or 3, and end with the digit 4, 5, or 6?

#### Quantity A

$\frac{100!}{99!}$

#### Quantity B

$\frac{ (100!-99!)}{98!}$

#### Quantity A

$\frac{(5!+6!)}{(6!+7!)}$

#### Quantity B

$\frac{1}{6}$

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