求助prep 27ps

27.   3330-!-item-!-187;#058&003295
                    D

38, 69, 22, 73, 31, 47, 13, 82

Which of the following numbers is greater than three-fourths of the numbers but less than one-fourth of the numbers in the list above?

(A) 56

(B) 68

(C) 69

(D) 71

(E) 73

【答案】D

【思路】將上述的sequence由小到大重新排列 13,22,31,38,47,69,73,82

        假設題目要求的number為X,X大於數列的
                            ,小於數列的
                            

      數列共有8個數, X8=6, X8=2

        so, 69<X<73, 答案為71(D)

为什么这道题的题干我一点也看不懂啊？有哪位牛牛能给我解释一下？

有人会解这道题吗？或是看得懂解释也行啊！

哪位大侠出手相助