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GMAT数学精华题型解析（4）
来源：GMAT考试 发布时间：2013-01-07 GMAT考试辅导视频 评论
106. 11122-!-item-!-187;#058&007588
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(2.5倍的) from the mean?
(A) 12.0
(B) 13.5
(C) 17.0
(D) 23.5
(E) 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;#058&007646
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 (1-2倍的)below the mean. Which of the following could be the number of hours that Pat watched television last week?
(A) 30
(B) 20
(C) 18
(D) 12
(E) 6
【答案】 D
82. 7356-!-item-!-187;#058&005489
Is
(1) x2 > y2 可用坐标抛物线看出
(2) x > y
【答案】A
(1) x2 > y2 平方已將正負數的影響拿掉(等同於絕對值) ←選項(1)成立
(2) 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(2)不成立
99. 9270-!-item-!-187;#058&006322
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(2.5倍的) from the mean?
(A) 12.0
(B) 13.5
(C) 17.0
(D) 23.5
(E) 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;#058&007646
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 (1-2倍的)below the mean. Which of the following could be the number of hours that Pat watched television last week?
(A) 30
(B) 20
(C) 18
(D) 12
(E) 6
【答案】 D
82. 7356-!-item-!-187;#058&005489
Is
(1) x2 > y2 可用坐标抛物线看出
(2) x > y
【答案】A
(1) x2 > y2 平方已將正負數的影響拿掉(等同於絕對值) ←選項(1)成立
(2) 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(2)不成立
99. 9270-!-item-!-187;#058&006322
If m > 0 and n > 0, is
? 相减
(1) m < n
(2) x > 0
【答案】C
100. 9327-!-item-!-187;#058&006480
In the rectangular coordinate system shown above, does the line k (not shown) intersect quadrant II ?
(1) The slope of k is - 注意：答案是否定的，但只要确定，也是对的
(2) The y-intercept of k is -6.
【答案】A
110. 10493-!-item-!-187;#058&007240
If z^n = 1, what is the value of z ?
(1) n is a nonzero integer.(注意N可能是偶数，Z可能是负数的情况)
(2) z > 0
【答案】C
113. 11760-!-item-!-187;#058&007855
For a certain set of n numbers, where n > 1, is the average (arithmetic mean) equal to the median?
(1) 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.
(2) The range of the n numbers in the set is 2(n - 1).
【答案】A
? 相减(1) m < n
(2) x > 0
【答案】C
100. 9327-!-item-!-187;#058&006480
In the rectangular coordinate system shown above, does the line k (not shown) intersect quadrant II ?
(1) The slope of k is - 注意：答案是否定的，但只要确定，也是对的
(2) The y-intercept of k is -6.
【答案】A
110. 10493-!-item-!-187;#058&007240
If z^n = 1, what is the value of z ?
(1) n is a nonzero integer.(注意N可能是偶数，Z可能是负数的情况)
(2) z > 0
【答案】C
113. 11760-!-item-!-187;#058&007855
For a certain set of n numbers, where n > 1, is the average (arithmetic mean) equal to the median?
(1) 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.
(2) The range of the n numbers in the set is 2(n - 1).
【答案】A
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