【求助】XDF数学题~求详解大侠进！

diyifang · 发表于 2014-3-1 12:14:50

最近刚做几道XDF的题目，就错一片，有些不知道是怎么出来的答案，求各位帮我讲讲~

8.The arithmetic mean od a data set is 46 and the standard deviation of the set is 4.Which calue is exactly 1.5standard deviations from the arithmetic mean of the set?
A42 B44.5 C47.5 D50 E52

9.For how many integers n is 2的n次方=n的2次方?
ANone B 1 C2 D3 E >3

12.A truck departed from N at 11:53 a.m. and arrived in F ,240 miles away, at 4:41 p.m. on the same day.What was the approximate average speed of the truck on this trip?
A16/1200MPH B240/288MPH C1494/240MPH D50MPH E5640/5MPH

37.Candy hearts were marked down from 30%-50% on Valentine's Day .The following day ,candy hearts were marked down an additional 25%.What was the lowest cost of a candu heart that originally sold for $28?
A7 B12.6 C14 D15.4 E21

感谢各位大侠~~小女子先感谢各位了！

diyifang · 发表于 2014-3-1 22:59:39

解决了。我BF就是给力！

【求助】XDF数学题~求详解大侠进！

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【求助】XDF数学题~求详解 大侠进！

所属分类: GMAT考试

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【求助】XDF数学题~求详解大侠进！