[計量] 3題陳向東+1題機經請教
1. T is no more than 20 percent greater than the integer x,
and T is no smaller than a number 20 percent less than the integer x.
If T = 60, which of the following indicates the smallest possible
interval for x?
A. 40=<x=<80
B. 48=<x=<75
C. 48=<x=<72
D. 50=<x=<78
E. 50=<x=<75
答案是E，話說我推出 60*0.8<x<60*1.2 感覺C更小啊...
2. If 55percent of a group of people have brown hair and 80percent of the same
group do not have red hair, what fraction of those who do not have brown hair
have red hair?
A: 4/9
3. If the perimeter of a triangle is 18, then the length of one of the sides
CANNOT be
答案是9，因為兩邊和=第三邊
可是我覺得另一個答案1也會造成同樣的情況(1+8=9)所以是題目錯了嗎??
4. A tennis game is played between two players. A player wins the game if he
wins three out of the total sets.
colA. probability that the match is decidedin the first three match
colB. 0.15
印度網答案給B 因為0.5*0.5*0.5=0.125<0.15
可是我覺得1.題目沒有給誰的勝率比較高
2.問誰贏，因為機率不同，A的答案也不同
請問大家有何看法?
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