※ 引述《jeff77766 (王天霸)》之銘言： : 想請問一題在 最新GRE數學預測模擬試題(一)的題目 : 25. the company at which Mark is employed has 80 employees each of whom has a : different salary. Mark's salary of $43,700 is the second-highest salary in the : first quartile of the 80 salaries. Mark 是最低四分之一裡的第二高 -> 排名= (80/4)-1 = 19 : If the company were to hire 8 new employees : at salaries that are less than the lowest of the 80 salaries, 加了8個22k， Mark 排名 = 19+8 = 27 : what would : Mark's salary be with respect to the quartiles of the 88 salaries at the : company, assuming no other changes in the salaries? 88 個人，每個quartile = 22人 27名 = 1 quartile + 5 人 -> (E) : A The 4th-highest salary in the first quartile : B The highest salary in the 1st quartile : C The 2nd-lowest salary in the 2nd quartile : D The 3rd-lowest salary in the 2nd quartile : E The 5th-lowest salary in the 2nd quartile : 答案是E : 如果插入的薪水是最低的八筆 : 不是應該不會影響到前面的四分位數嗎? 因為總人數改變了 : 可是這樣看來就發現根本沒答案可選 : 好奇怪阿 : 請大家幫我解惑 : 謝謝大家!! --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.128.223.100 ※ 編輯: johnlinvc 來自: 220.128.223.100 (12/09 17:57)