How does Angela feel about the service of Global Freight Forwarding Company?()
A. They are very professional and considerate.
B. They are professional but not patient enough.
C. They are unclear about many items of shipment.
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事件A和B是独立的,当且仅当______ 。(说明:写定理的直接形式,不要写推论结果,不需要使用交集、并集等符号,和手写一样即可)
贝叶斯推断参数的先验分布可以使用扁平先验和markov先验
随机变量X、Y的数学期望E(X)=-1,E(Y)=2,方差D(X)=1,D(Y)=2,且X、Y相互独立,则E(2X-Y)和D(2X-Y)的值分别为()
A. -4,6
B. -4,4
C. -3,4
D. -3,6