PP-T1-PS181

[小花]

181. 19782-!-item-!-187;#058&012457
Three boxes of supplies have an average (arithmetic mean) weight of 7 kilograms and a median weight of 9 kilograms. What is the maximum possible weight, in kilograms, of the lightest box?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

Ans:C

題目問 lightest box 最大值可能為?
那我設最重的為10 最輕的X
X+9+10/3=7
X=21-19
X=2
不知哪裡錯了?

[Huang Hsin-Yi]

若 最重的box為 9 則 以下排列也符合條件
3,9,9

average=9
median =9