求助几道数学题

chenzhexi · 发表于 2011-9-19 10:15:52

9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.5
1.The mwan and the standard deviation of the 8 number shown are 10.0 and 3.0.What percent of the 8 numbers are within 1 standard deviation of the mean? 这个题目没怎么看懂

2.In a certain senior class,72 percent of the male students and 80 percent of the female students have applied to college.What fracion of the students in the senior class are male?
(1) There are 840 students in the senior class.
(2) 75percent of the students in the senior class have applied to college.

3.Which of the fpllowing lists the number of points at which a circle can intersect a triangle?（题目什么意思？）
a.2 and 6 only
b.2,4 and 6 only
e.1,2,3,4,5 and 6

4.Of the 800 employees of Company X,70 percent have been with the company for at least ten years.If Y of these "long-term"menbers were to retire and no other employee changes were to occur,what value of Y would reduvce the percent of "long-term"employee in the company to 60 percent?

wyw1018 · 发表于 2011-9-19 10:39:15

第1题就是说在平均数1个标准差范围即 10.0+/-3.0 也即7～13，但是标准差3不对，你肯定写错了。
第3题就是说一个园与一个三角形相交能有几个交点，好像默认是必须相交，所以 1 2 3 4 5 6个交点都有可能，忽略了不相交的情形。

求助几道数学题

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块