[計量] 幾題問題請教

[tecoteco (teco)]

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)



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)



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)



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?)



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)



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)



以上六題  懇請解答!!


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推 passgirl:第2題我問過了喔，你可以看前幾天的回文!
推 burgessx:請問樓上 可以問依下再哪一篇嬤? 我找不到第二題的答案..
推 flac:第二題答案是怎來的阿?
推 flac:你的題目是哪來的呢? 怎好像部分答案與題目都不是很準確
推 flac:第二題答案應該是 I與II 因為中位數必定落在175~225之間
→ tecoteco:看來有的應該是題目本身的問題... 但還是謝謝大家!!