作者lita1156 (小呀比)
看板Statistics
标题[问题] 想请问一题统计问题
时间Sun Apr 30 17:07:38 2006
consider the following probability density function:
f(x)=kx, 0<=X<2,
=k(4-x), 2<=x<=4,
=0 otherwise.
what is the variance of X?
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1F：推 breadevil:先求k....再求E(x)和E(x^2)解var就可以噜 05/01 09:42