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GRE数学OG解析难题汇总14

2018-10-04 15:22:00来源:网络

  GRE数学部分是中国考生的强项,当然高分背后, 也是同学们辛苦的复习。对于GRE数学考中一些比较经典的难题,大家需要花费更多的精力来练习。掌握这些题目的解题方法,才能够辅助我们在真正的考试中,更好地应对各种数学题型。新东方在线GRE频道为大家整理了GRE数学OG中的难题解析,供大家参考。

  18.The range of the heights of the female students in a certain class is 13.2 inches, and the range of the heights of the male students in the class is 15.4inches.

  Which of the following statements individually provide(s) sufficient additional information to determine the range of the heights of all the students in the class?

  Indicate all such statements.

  A The tallest male student in the class is 5.8 inches taller than the tallest female student in the class.

  B The median height of the male students in the class is 1.1 inches greater than the median height of the female students in the class.

  C The average (arithmetic mean) height of the male students in the class is 4.6 inches greater than the average height of the female students in the class.

  分析:在数轴上我们可以画出一段表示女生身高范围,另一段表示男生身高范围,

  A选项告诉我们的是男生最高的比女的最高的高5.8inch,那么我们就可以确定两段的相对位置了,因此总的身高范围就可以确定了。选项A就是对的了。

  B选项,由于没有告诉我们男女生的人数,所以这个是无法确定的

  C选项,这个选项跟上面的B差不多,没法确定。附上OG的解答,以作参考:

  Choice B provides information about one of the centers of the data—the median; it does not say anything about how spread out the data are around that center. You are given that the median height of the males is 1.1 inches greater than that of the females. First note that it is possible for two different sets of data to have the same median but have very different ranges. Choice B gives the difference between the medians of the male heights and the female heights, without giving the actual medians. However, even if you knew the medians, the fact that the ranges can vary widely indicates that the range of the heights of the entire class can also vary widely. It is possible to construct examples of heights of students that satisfy all of the information in the question and in Choice B but have different ranges for the heights of the entire class. Here are two such examples, each of which has only three females and three males. Although the examples are small, they illustrate the fact that the range of the heights of the entire class can vary. In both examples, the range of female heights is 13.2, the range of male heights is 15.4, and the difference between the median heights is 1.1 inches.

  Example 1

  Female heights: 50.0 56.6 63.2 which have a median of 56.6

  Male heights: 50.0 57.7 65.4 which have a median of 57.7

  Range of heights of entire class: 15.4

  Example 2

  Female heights: 50.0 56.6 63.2 which have a median of 56.6

  Male heights: 51.0 57.7 66.4 which have a median of 57.7

  Range of heights of entire class: 16.4

  Therefore, Choice B does not provide sufficient additional information to determine the range of the heights of the entire class.

  Choice C provides information about another center of the data—the average. You are given that the average height of the males is 4.6 inches greater than that of the females. However, like Choice B, the statement gives no information about how spread out the data are around that center. Again, it is possible for two different sets of data to have the same average but have very different ranges. Examples similar to the two examples above can be constructed that satisfy all of the information in the question and in Choice C but have different ranges for the heights of the entire class. Therefore, Choice C does not provide sufficient additional information to determine the range of the heights of the entire class.

  以上就是关于“GRE数学OG解析难题汇总14”的内容,更多精彩内容,请关注GRE频道!


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