Let f(x)=1/9 x^2 if x lies in the interval (0,3) and 0 otherwise. 1.Calculate P(0<X<2) 2.What is the expected value of X?
回答 (1)
2017-10-16 6:36 pm
✔ 最佳答案
Sol(1)
P(0<X<2)=∫(0 TO 2)_x^2/9dx
=x^3/27｜(0 to 2)
=8/27
(2)
EX=∫(0 TO 3)_x*x^2/9dx
=x^4/36｜(0 to 3)
=81/36
=9/4
收錄日期: 2021-04-30 22:31:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20171016085131AAbMzfA