我
- 1
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已知随机变量ξ的分布列是：
ξ
0
1
2
3
4
5
P
0.1
0.2
0.3L
0.2L
0.1L
0.1L
则Eξ=__________．
- 1
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- A.<img src="//img1.yqda.net/question-name/83/6726d4d83da0d7675ed477214eaace.jpg" alt="" />
- B.<img src="//img1.yqda.net/question-name/25/ca15c7438d02a0499822a812e41e46.jpg" alt="" />
- C.<img src="//img1.yqda.net/question-name/fd/ae89cc80de846acab4081e11629fcb.jpg" alt="" />
- D.<img src="//img1.yqda.net/question-name/6d/024fa0e406d5ffdf7b3542bd86d4a9.jpg" alt="" />
- A.ab>2b
- B.2a≥a
- C.<img src="//img1.yqda.net/question-name/e0/f6c99b035c9ae5c1bc218f4d4c453b.jpg" alt="" />
- D.a2>2a
- 5
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