GMAT数学精华题型解析(4)

　　GMAT数学考试常见题型的解题技巧有哪些呢?以下将为大家深入分析GMAT数学考试常见题型的解题策略和技巧，希望能够为考生备战GMAT数学考试带来帮助。

　　106. 11122-!-item-!-187;#058007588

　　If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?

　　 12.0

　　 13.5

　　 17.0

　　 23.5

　　 26.5

　　【答案】 A

　　几倍的标准差，就用平均值加减几倍的标准差，即为新的值域

　　110. 11364-!-item-!-187;#058007646

　　The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching television. The distribution of the results of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean. Which of the following could be the number of hours that Pat watched television last week?

　　 30

　　 20

　　 18

　　 12

　　 6

　　--------------------------------------------------------------------------------------------------------------------------------

　　【答案】 D

　　82. 7356-!-item-!-187;#058005489

　　Is

　　 x2 y2 可用坐标抛物线看出

　　 x y

　　--------------------------------------------------------------------------------------------------------------------------------------------------------

　　【答案】A

　　 x2 y2 平方已將正負數的影響拿掉 選項成立

　　 x y 的情況下，y有可能為負數。如此一來y的絕對值不一定小於x。 選項不成立

　　99. 9270-!-item-!-187;#058006322

　　If m 0 and n 0, is? 相减

　　 m n

　　 x 0

　　【答案】C

　　100. 9327-!-item-!-187;#058006480

　　In the rectangular coordinate system shown above, does the line k intersect quadrant II ?

　　 The slope of k is - 注意：答案是否定的，但只要确定，也是对的

　　 The y-intercept of k is -6.

　　【答案】A

　　110. 10493-!-item-!-187;#058007240

　　If z^n = 1, what is the value of z ?

　　 n is a nonzero integer.

　　 z 0

　　【答案】C

　　113. 11760-!-item-!-187;#058007855

　　For a certain set of n numbers, where n 1, is the average equal to the median?

　　 If the n numbers in the set are listed in increasing order, then the difference between any pair of successive numbers in the set is 2.

　　 The range of the n numbers in the set is 2.

　　【答案】A

　　以上为大家推荐了一些GMAT数学试题的使用解题技巧，考生不妨从中借鉴，通过针对性的练习来逐步掌握GMAT数学考试的解题技巧，从而在GMAT考试中发挥出更好的水平。