返回列表 发帖

数学题请教做法

1.A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster.  If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?

 

 

A.        0

B.        1/9

C.        2/9

D.       1/3

E.        1

2.A gardener is going to plant 2 red rosebushes and 2 white rosebushes.  If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

 

 

A.      1/12

B.      1/6

C.      1/5

D.     1/3

E.      1/2

3.What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.

(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

4.When Leo imported a certain item, he made a 7 percent import tax on the portion of the total value of the item in excess of  $1,000.  If the amount of the import tax that Leo paid was $87.50, what was the total value of the item?

 

 

A.      $1,600

B.      $1,850

C.      $2,250

D.     $2,400

E.      $2,750

5.A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.  The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.  How many such arrangements of the 6 people are possible?

 

 

A.      5

B.      6

C.      9

D.     24

E.      36

3.What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.

(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

4.When Leo imported a certain item, he made a 7 percent import tax on the portion of the total value of the item in excess of  $1,000.  If the amount of the import tax that Leo paid was $87.50, what was the total value of the item?

 

 

A.      $1,600

B.      $1,850

C.      $2,250

D.     $2,400

E.      $2,750

5.A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.  The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.  How many such arrangements of the 6 people are possible?

 

 

A.      5

B.      6

C.      9

D.     24

E.      36

3.What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.

(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

4.When Leo imported a certain item, he made a 7 percent import tax on the portion of the total value of the item in excess of  $1,000.  If the amount of the import tax that Leo paid was $87.50, what was the total value of the item?

 

 

A.      $1,600

B.      $1,850

C.      $2,250

D.     $2,400

E.      $2,750

5.A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.  The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.  How many such arrangements of the 6 people are possible?

 

 

A.      5

B.      6

C.      9

D.     24

E.      36

收藏 分享

1.2/9 三次都挑到不同车的概率,6/27

2.1/6 自己种一下

3.C   25%>=4 35<=2....40%=3

4.C($2250)   列一元一次方程解

5.A 五种     最高的只能在第二排最右,最矮的只能在第一排最左;第二高的只能在第二排中间或第一排最右

TOP

many  thanks !!!!

TOP

返回列表

站长推荐 关闭


美国top10 MBA VIP申请服务

自2003年开始提供 MBA 申请服务以来,保持着90% 以上的成功率,其中Top10 MBA服务成功率更是高达95%


查看