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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%
这题啥意思呀
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.
这题为啥选B呢
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.
这题又何解呢？
希望各位牛人朋友们帮帮忙，俺实在是不知咋整
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.
这题为啥选B呢
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.
这题又何解呢？
希望各位牛人朋友们帮帮忙，俺实在是不知咋整 |
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发表于 2011-3-16 11:54:50
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