GMAT数学逻辑每日一练

　　【数学】

　　Of the 13employees in a certain department, 1 has an annual salary of $38,000, 2 have anannual salary of $45,000 each, 2 have an annual salary of $42,500 each, 3 havean annual salary of $40,000 each, and 5 have an annual salary of $48,500each.  What is the median annual salaryfor the 13 employees?

　　(A) $38,000

　　(B) $40,000

　　(C) $42,500

　　(D) $45,000

　　(E) $48,500

　　【逻辑】

　　Which of the following most logically completes the passage below? Heavy rains during Centralia's corn planting season prevented some farmers there fromplanting corn. It is now the planting season for soybeans, another of Centralia's principal crops, and those fields originally intended for corn aredry enough for planting. Nonetheless, even though soybean prices are unusually high at present, the farmers wil leave most of these fields empty rather thanplant them with soybeans, since_____________.

　　A.    the extensive rains have led toan increase in the price of corn

　　B.    some Centralian farmersanticipate serious financial losses due to the extremely wet spring plantingseason

　　C.    chemicals that were used toprepare the fields for corn planting would stunt the growth of soybeans

　　D.    the majority of Centralia'scorn farmers were able to plant corn as they had intended, despite the wetplanting season

　　E.     many Centralian farmers growboth corn and soybeans

　　答案

　　【数学】

　　答案：D题目翻译：13 个职员，一人的年收入为 38,000， 两人的年收入为 45,000， 两人的年收入为 42,500， 三人的年收入为 40,000， 五人的年收入为 48,500. 这 13 为职员年收入的中位数是多少？

　　思路点拨：中位数问题，先排序后取中。

　　题目全解：13 个人的中位数 7 所以落在$45000 的族群

　　【逻辑】

　　Reasoning

　　Why would the farmers leave the fields empty even though conditions suggest it would be profitable to plant soybeans? The farmers were not able to plant corn this year. Consequently, why would they not make up for it by

　　planting soybeans? Soybean prices are especially high, so it would presumably be profitable to plant them. Why would the farmers leave the fields empty instead? Look for an answer option suggesting why it would be unprofitable or unfeasible for them to take advantage of the conditions favoring soybean planting.

　　A.     Corn planting season is over, and therefore the farmers could not plant corn to profit from the high corn prices-and even if they could, it would not explain why they are leaving the fields empty.

　　B.     This does not explain why the farmers are not planting soybeans. If the farmers anticipate serious financial losses, that would be all the more reason for them to try to recover financially by planting soybeans.

　　C. Correct. This gives a good reason for not planting soybeans. It might not be profitable to do so.

　　D.     The passage is about the farmers who could not plant corn, not about those who could.

　　E.      If the farmers are accustomed to planting soybeans, it would probably be even easier and more profitable for them to do so this year rather than leaving the fields empty.

　　The correct answer is C.