Re: [計量] 幾題問題請教
※ 引述《tecoteco (teco)》之銘言：
: 1. 5x = 2y and xy ≠ 0, then is what percent of y ?
: Ans: 40% (不會做,覺得題目錯了或是條件給太少)
我覺得是題目不健全耶。百分之幾的Y在問誰?
: 2. 150, 200, 250, n
: which of the following could be the median of the 4 integers listed above?
: I. 175
: II. 215
: III. 235
: Ans: II and III only (不懂,個人覺得答案應該是 I and II only)
前面有人回文給我了，關於中位數的問題。很清楚。
: 3. If a code word is defined to be a sequence of different letters chosen
: from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio
: of the number of 5-letter code word to the number of 4-letter code words?
: Ans: 6 to 1 (完全看不懂題目)
從10個數字裡選6個字母排列 : 從10個數字裡選五個字母排列
10*9*8*7*6 : 10*9*8*7 = 6 : 1
: 4. Which of the following is equal to (2k)(5k-1)?
: A. 2(10k-1) B. 5(10k-1) C. 10k D. 2(10k) E. 102k-1
: Ans: A (明明題目有k*k, 為什麼答案都只有一個k?)
2k*(5k-1)= 10k^2-2k=k(10k-2) 選項寫錯了吧!
: 5. From a group of 3 boys and 3 girls, 4 children are to be randomly
: selected. What is the probability that equal numbers of boys and girls
: will be selected ?
: Ans: 4/9 (個人覺得答案應該是3/5)
2男2女
C(3,2)(C3,2)/C(6,4)= 3/5
: 6. Which of the following fractions has a equivalent that is a terminating
: decimal ?
: A. 10/189 B. 15/196 C. 16/225 D. 39/128
: Ans: D (看不懂題目)
個位數2 or 5結尾的是terminating decimal(注意需不需要約分)
: 以上六題 懇請解答!!
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