作者wolf035 (重返1994)
看板Statistics
标题[问题] 机率求解
时间Mon Apr 24 15:47:37 2006
The actual tracking weight of a stereo cartridge that is set to track
at 3 gm on a particular changer can be regarded as a continuous random
variable X with probability density function
f(x)= k[1-(x-3)^2] , 2≦X≦4
0 , otherwise
(a)找出k值
(b)what is the probability that the actual tracking weight
is greater than the prescribed weight?
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