Re: [計量] 求解幾題數學part2
※ 引述《bonitala (Bonita)》之銘言：
: 又來麻煩大家了!!
: 請大家多多指教~~
: 1.Pat has 7 blue paired-socks and 7 black paired-socks in a bag. How
: many socks must be taken out by Pat to make sure of getting a pair of socks
: of the same color?
: Ans:15
前14隻可能拿到7隻同腳的藍及7隻同腳的黑
再一隻就保證有一對了
: 2.which of the following integers does NOT have a divisor greater than 1 that
: is the square of an integer?
: Ans:42
42為2、3、7三個質數的乘積
故除了1以外沒有任何因數為任一整數之平方
: 3.比大小
: the volumes of cubes A and B are 1728 cubic meters and 13824 cubic meters.
: column A: the ratio of the surface area of cube A to that of cube B
: column B:1/2
: Ans:A
: 但我跟同學算出來A都是1/4，所以答案不是應該是B嗎??
我算也是1/4
: 4.比大小
: The average of 18 numbers is m, and their standard deviation is s. Two of
: these numbers are equal to m and discarded.
: column A:The standard deviation of the remaining 16 numbers
: column B:s
: Ans:A
standard deviation計算時要除以樣本數
樣本數少2
分母變小分子不變 => A > s
: 以上，多謝大家的幫忙!!
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05/27 11:32, , 1F
05/27 11:32, 1F
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