有關10123P010202030101的精選大全

若隨機變量X的分佈列為X-2-10123P0.10.20.20.30.10.1則當P(X<a)=0.8時...
問題詳情:若隨機變量X的分佈列為X-2-10123P0.10.20.20.30.10.1則當P(X<a)=0.8時,實數a的取值範圍是()A.(-∞,2]                      B.[1,2]C.(1,2]                        ...
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