[問題]GWD26-Q15

[applepeko]

Q15:
If the average (arithmetic mean) of 5 different numbers is 12, what is the median of the 5 numbers?
(1) The median of the 5 numbers is equal to 1/3 of the sum of the 4 numbers other than the median.
(2) The sum of the 4 numbers other than the median is equal to 45.

有人可以幫我解答這題嗎??
我不大懂. ...謝謝

[lance921]

應該是D 兩個任一個皆成立
不要被中位數騙了 那個無所謂

(X+x1+x2+x3+x4)/5 =12
(A) X= (x1+x2+x3+x4)/3
(B) x1+x2+x3+x4 = 45
x1+x2+x3+x4 =y
calculate X and Y
(A) or (B) is enough so the answer is D

[applepeko]

先謝謝妮的回答歐!!!
(X+x1+x2+x3+x4)/5 =12
(A) X= (x1+x2+x3+x4)/3
(B) x1+x2+x3+x4 = 45
到這裡為止我還懂
以下這些可以再幫我解釋一下嗎?
為什麼中位數無所謂...
不好意思我理解力弱了
x1+x2+x3+x4 =y
calculate X and Y
(A) or (B) is enough so the answer is D

[lance921]

就是假設 x1+x2+x3+x4 =Y
題目 X+Y=60
(A) X=Y/3
(B) Y=45

題目 與A 可求出 X Y 解
題目 與B 可求出 X Y 解
所以A or B 都能夠幫我們算出X

[applepeko]

啊!!懂了!!不好意思我後知後覺...感動耶這麼晚還幫我解答...
謝謝呢!!