[問題]GWD 00-03

[happyjoy]

Q3:
Each of the 45 boxes on shelf J weighs less than each of the 44 boxes on shelf K. What is the median weight of the 89 boxes on these shelves?

(1) The heaviest box on shelf J weighs 15 pounds.
(2) The lightest box on shelf K weighs 20 pounds.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.


請問這題的答案為什麼是 A 壓?
這個跟最輕最重有關係嗎 ?
能選A , 那B為什麼不能選 ?
謝謝解答 !

天壓....誰說東方的小孩數學都很強? 我就是例外... :'(

[micht]

Q3:
Each of the 45 boxes on shelf J weighs less than each of the 44 boxes on shelf K. What is the median weight of the 89 boxes on these shelves?

(1) The heaviest box on shelf J weighs 15 pounds.
(2) The lightest box on shelf K weighs 20 pounds.


天壓....誰說東方的小孩數學都很強? 我就是例外... :'(

我也不好 不過這題我可以理解就是

(each45) J<(44個) K
共有89個

medium 就是 J 裡面最重的 所以選A

----44個----1個----44個-----

[happyjoy]

了解了解 ~~
感恩 !

[csc]

兩位前輩

小弟才疏學淺，不懂這解釋原因，請再做說明一些

happyjoy 寫到:
Q3:
Each of the 45 boxes on shelf J weighs less than each of the 44 boxes on shelf K. What is the median weight of the 89 boxes on these shelves?

(1) The heaviest box on shelf J weighs 15 pounds.
(2) The lightest box on shelf K weighs 20 pounds.


天壓....誰說東方的小孩數學都很強? 我就是例外... :'(


我也不好 不過這題我可以理解就是

(each45) J<(44個) K
共有89個

medium 就是 J 裡面最重的 所以選A

----44個----1個----44個-----

[OREO]

Median 是中位數
所以當 J裡(45個的任何一個) < K裡(44個任何一個)

所以當我們排列如果J裡面最重的箱子是15 pounds

一定是先排列J最前面44個比15pounds 輕的..然後再來是15pounds再來是K的44個

所以先排J的44個..再來最重的J.....最後K的44個

[chris8888]

1).可以正確解釋大家都知道,

致於2). 因為他是說K箱子裡最輕的是20 pounds, 但J箱子裡面通通比它輕, 所以一定小於20,
中位數一定是落在45的位置, 可是小於20的數很多, 從1 ~ 1.1 ~ 19.9 <== 通通都是小於20丫, 那到底第45的中位數會是多少? 不得而知?
因此2). 不充分