作者bnm51315 (辛苦的耕耘)
看板trans_math
标题[偏微] 请教一题偏微题目
时间Wed Jun 24 22:41:44 2009
f(x,y)=c is joint probability density function with x^2 + y^2 <= 1 and y>= 0
please find
(a) c and f(x,y) , f(x) , f(y)
(b) E(x,y) ( ie. Expectation of xy ), E(x^2), E(y^2)
(c) E(x), E(y)
小弟不太懂其中提到的joint probability density function
还请各位先进指教 顺便帮忙解一下这题的答案
麻烦罗 ^^
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◆ From: 163.22.18.78
1F：→ Arthur4f:这是机率吧= ="? 61.64.84.220 06/24 22:56
2F：→ bnm51315:搞不太懂在问什麽 所以... = =+ 163.22.18.78 06/24 23:08
3F：推 zptdaniel:这个可能去机率或统计版问吧123.194.100.216 06/24 23:15
4F：→ zptdaniel:joint PDF...真怀念123.194.100.216 06/24 23:15
5F：→ lovehan:微积分有一章有讲这个没错啊...XDDDDD 59.105.44.199 06/24 23:24