[討論] 想問一題應該不難的統計題目
題目:
f(x,y)=2x 0<X<1 0<y<1
the covariance of X and Y is?
(a)1/6 (b)1/3 (c)1/2 (d)2/3
我自己算出來答案是0啦
不過選項都沒得選...而且沒解答可以看
明天有考試這種題目還算不出來實在很不安...
麻煩大家幫小弟解惑一下 感謝
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