Ask for help about prep 15th M 2nd, 28th, 35th

yejingxian

sorry to bother everyone, I at library and can not use chinese, could someone help me to figure out the three questions. Thanks in advance.

Q2:

A certain characteristic in a large population has a distribution that is symmetric about the mean m.  If 68 percent of the distribution lies within one standard deviation d
of the mean, what percent of the distribution is less than m + d ?


A.     16%

B.     32%

C.     48%

D.     84%

E.      92%

Answer:

Q28:

A school administrator will assign each student in a group of n students to one of m
classrooms.  If 3 < m < 13 < n, is it possible to assign each of the n students to one of the m classrooms so that each classroom has the same number of students assigned to it?
(1)   It is possible to assign each of 3n students to one of m
classrooms so that each classroom has the same number of students assigned to it.
(2)   It is possible to assign each of 13n students to one of m
classrooms so that each classroom has the same number of students assigned to it.
                 

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.

Answer:

Q35:

For what percent of those tested for a certain infection was the test accurate; that is, positive for those who had the infection and negative for those who did not have the infection?

(1)   Of those who tested positive for the infection,
did not have the infection.
(2)   Of those tested for the infection, 90 percent tested negative.

                 

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.

Answer:

zscsl

haha. gang mai de new computer. mei lai de ji zhuang.

ni shuo wo shi zhong guo ren ma?

-- by 会员 lisa8899 (2009/12/10 11:39:02)

哥哥。。我错了。。你是正宗的

-- by 会员 zscsl (2009/12/10 11:40:40)

貌似是姐姐哟。。。

zscsl

haha. gang mai de new computer. mei lai de ji zhuang.

ni shuo wo shi zhong guo ren ma?

-- by 会员 lisa8899 (2009/12/10 11:39:02)

哥哥。。我错了。。你是正宗的

lisa8899

haha. gang mai de new computer. mei lai de ji zhuang.

ni shuo wo shi zhong guo ren ma?

zscsl

他必然不是中国的。。。中国人电脑里怎么没有中文输入哟。这么拽哈。。。

yejingxian

I cant type Chinese either.  hard questions! BTW, how can I download the prep? Thanks.

-- by 会员 lisa8899 (2009/12/10 6:13:04)

你是中国人吗？应该知道如何下载的吧

lisa8899

I cant type Chinese either.  hard questions! BTW, how can I download the prep? Thanks.