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the following table is the joint probability mass function of two discrete random
variables X and Y
x=-1 x=0 x=1 x=2
y=-1 0.2 0.1 0.1 0.1
y=1 0.2 0.1 0.1 0.1
1.find E ( X ) and var ( X )
2. find E(Y 2)
3. Are X and Y independent of each other?

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the following table is the joint probability mass function o.pdf

  • 1. the following table is the joint probability mass function of two discrete random variables X and Y x=-1 x=0 x=1 x=2 y=-1 0.2 0.1 0.1 0.1 y=1 0.2 0.1 0.1 0.1 1.find E ( X ) and var ( X ) 2. find E(Y 2) 3. Are X and Y independent of each other?