Re: [計量] Six amounts are given say 358$, ...
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※ 引述《mybuddha (假以時日)》之銘言：
: 1. Given a = (m+p)^2 & b = (m-p)^2. If 3^a/3^b = 3^4, thenCol A: mp Col B: 1
: Answer: C
3^a/3^b = 3^(a-b) = 3^4
a-b = 4
(m+p)^2-(m-p)^2 = 4
(m+p+m-p)(m+p-m+p) = 4
2m*2p = 4
mp = 1
ans: c
: 2.Six amounts are given say 358$, 600$, 478$, 786$, 900$ & 983$.
: These amounts represent the profit made by 6 people.
: Out of these 6 values, there is error in 2 of them,
: one has been increased by 120$
: and one has been decreased by 120$ by mistake.,
: Col A: Standard Deviation of the data given
: Col B: Standard Deviation of the actual values (without error)
: Answer: D? B?
我個人猜D
因為不確定錯誤是出現在哪一個數字
: 這是目前最新的jj
: 但怎麼算呢？
: 實在受挫
: 煩請高手解惑
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