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标题: TT GWD 22-15答案错吧？ [打印本页]

作者: albertes 时间: 2007-1-14 07:00 标题: TT GWD 22-15答案错吧？

Q15:

The average (arithmetic mean) of a list of numbers is what percent of the sum of the numbers?

(1) There are 8 numbers in the list.

(2) The sum of the numbers in the list is 100.

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.

答案是A，怎么有理由呢？

作者: 卡通猫王 时间: 2007-1-14 13:20

没错吧？答案是A。

平均值＝和/n 所以平均值占总和得比例就是1/n

作者: tangjinxiong 时间: 2007-1-15 20:20

只能是A，设总数和为X，平均数就是X/8，这样比例就腿出来了

B只给了总数和，没写有几个数，所以腿不出来

作者: albertes 时间: 2007-1-19 13:07

thanks @@@@@

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