[問題]GWD27-Q14

[applepeko]

Q14:
The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively. If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?


I. 3
II. 7
III. 12


A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III

答案是D,我題意有點不懂......謝謝幫忙內!!

[kwtluck]

題目是說生產線上5輛車的瑕疵數各為9, 7, 10, 4, 6
又說第6輛車的瑕疵數可能為3或7或12
求:第6輛車的瑕疵數為?時, 6輛車的平均瑕疵數=6輛車的中位數

[注意]先將數字由小至大排出,才能求出中位數
5輛車瑕疵數: 4,6,7,9,10
?=3時, (3+4+6+7+9+10)/6 = (6+7)/2 =6.5 (ok)
?=7時, (4+6+7+7+9+10)/6 不等於 (7+7)/2
?=12時, (4+6+7+9+10+12)/6 = (7+9)/2 =8 (ok)
所以答案是=>D.I and III only

[applepeko]

歐歐!! 懂了懂了..
謝謝妮呢!!