[計量] 問幾題數學
9. Given five numbers like this....... n, n+20,n+30,n+40,n+50 and Arithematic
mean is also given(some value)
(Question is something like this)
Col A: Standard deviation
Col B: n
實在不了解標準差在這題要怎麼個應用法
3. Given.... p, q, r are prime numbers.
Col A: Factors of pqr (including) pqr and 1
Col B: 8
乍看之下似乎是選C 畢竟1 p q r pq pr rq pqr正好八個
可是-p -q -r...不也應該是pqr的因數嗎 factors應該可正可負吧??
所以Col B那個8反而是陷阱，應該選A?
4. Given an series of numbers....
Col A: The standand deviation of the series
Col B: The range of the series
不知道一串數字什麼額外條件都沒有的話
值域和標準差怎麼比較
10.There was a ladder given. The ladder is of length 5 and it is displaced
i.e slanted downwards such that it falls 'x'mts in height and its horizontal
length increases by 'y'mts.
Col A: x
Col B: y
我想選D因為應該是不確定，但是想問是不是漏掉什麼關係在裡面所以比不出大小
9. Given a square which is inscribed in another square & length of the side
of larger square is 4 and smaller square is 2. If four edges of the smaller
square is joined with four edges of larger square by a line ( to say
exactly.... a line from the midpoint of larger square side(edge) is joined to
the midpoint of smaller square side... similarly the other sides the two
squares are also joined) by this..... 8 trapeziums are formed (2 trapezium
per side). Find the perimeter of any one trapezium?
A. 4+(1.414)
B. 4+2(1.414)
C. 6+(1.414)
D. 6+2(1.414)
E. 6+4(1.414)
看不懂...
感謝強者回答
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