求助两道数学题！！！急！！在线等！

graceqiqi7312 · 发表于 2012-2-3 14:03:33

Q3:
Is the standard deviation of the salaries of Company Y’s employees greater than the standard deviation of the salaries of Company Z’s employees?
(1)   The average (arithmetic mean) salary of Company Y’s employees is greater than the average salary of Company Z’s employees.
(2)   The median salary of Company Y’s employees is greater than the median salary of Company Z’s employees.

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.

Q6:

The figure above shows the dimensions of a semicircular cross section of a one-way tunnel. The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel. If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A.   5½ ft
B.   7½ ft
C.   8 ½ ft
D.   9½ ft
E.   10 ft
请问这个1/2是指数还是带分数的意思？

graceqiqi7312 · 发表于 2012-2-3 14:05:39

figure是一个半圆，直径为20ft.
图片复制不上来，不好意思

zhangyi900427 · 发表于 2012-2-3 14:13:28

第1题是E吗？

graceqiqi7312 · 发表于 2012-2-3 14:14:43

是的，你是怎么做的呀？？

GMATHK2012 · 发表于 2012-2-3 14:18:17

啊很简单方差就是看数字是不是离散很大如果底下那个中值及平均数能反映的话，就不用这个方差了

graceqiqi7312 · 发表于 2012-2-3 14:20:12

哦。。。这样哦！谢谢了！第二题会做吗？

GMATHK2012 · 发表于 2012-2-3 16:40:16

GMATHK2012 · 发表于 2012-2-3 16:41:37

1/2 就是0.5 啊 8 1/2 就是8.5

acsc · 发表于 2012-2-3 17:09:04

第一题E,第二题B

graceqiqi7312 · 发表于 2012-2-3 21:17:28

第二题是怎么做的呀？

求助两道数学题！！！急！！在线等！

所属分类: GMAT考试

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