GRE考试数学方面的难点分析.

数学是GRE考试复习的重点，我们准备数学考试的时候要特别注意。掌握一些GRE词汇是不足以得到数学高分的，因为数学方面有一些难点我们必须注意。GRE数学题中的难点有哪些呢?澳际小编下面给大家分析一下：

　　(正态分布难题——选自《正态分布解密(GRE数学满分比备良药)》)

　　27.说人们的题中通常是服从正态分布，标准差为1之内的有多少a(给了，忘了)

　　percent，GRE考试标准差为2内的为95percent。问一个调查mean为18.6，则在6.8到12.6

　　之间为多少percent.

　　答(95-a)/2

　　From presented conditions, I guess a = 68.97%, Right? Anyone remembers -- please confirmed?

　　Because:

　　For Normal Distribution we talking about, it has certain statistical characteristics:

　　:: P(Probability) ={mean-stdev < X < mean+stdev} = 68.27%

　　:: P(Probability) ={mean-2stdev < X < mean+2stdev} = 95.45%

　　:: P(Probability) ={mean-3stdev < X < mean+3stdev} = 99.73%

　　This property indicates that for a specified Normal Distribution, the area from mean-3stdev to mean+3stdev covers 99.73% probability. Understand? (you must have learned from

　　lecture)

　　For this case, mean=18.6, stdev? Suppose the stdev=1, then, according to the conclusion from above, if a point has 99.73% probability falls in 15.6(18.6-3*1) to 21.6 (18.6+3*1); in other words, if a is within 10~12, we say "a" is not a member of this Normal Distribution, or, "a" is

　　just a small probability(<=0.7%) case. Right?

　　In general, if you wanna know the P(a

　　Normal Distribution Function Table.

　　::Conclusion

　　- This question may not be accurate, because for one Normal Distribution, it has only one stdev, while this question presented two? At the same time, 95% is so close to 95.45%, a ? Hence, I prer to my guess.

　　- On the other hand, suppose the question is correct. The answer MUST be not correct. Anyway, (a-b)/2 cannot connect with 6.8~12.6?

　　- My comments are just from personal point of view. I have no right

　　to force you to select this explanation.

　　上述就是小编总结的GRE考试数学方面的难点，同学们背诵GRE词汇的时候要特别的注意。数学的复习要注意很多方面的知识，多做一些经典的GRE数学题，这样同学们复习考试才会更加顺利。

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