Given the following probability distributions for X and Y variables presented table below.
P(x, y)
0.2
-100
y
50
0.4
50
30
0.3
200
20
0.1
300
20
Compute:

AE(X) and E(Y) where E(.) is the expectation.

Bσχand σy where o is the standard deviation

Cthe covariance Oxy

DVar (2X +3)