okay, I've tried:
we have two jointly distributed random variables, X and Y, with a joint density function you see at top.
a) calculate the probabilities
i) P(X =< 2, Y =< 1) ii) P (Y >= 1 )
b) estimate covariance (X,Y)
c) estimate the mean (?) E( e^X+Y)for the random variable e^X+Y
d) probability density function for the random variable x|y=b for a undefined number b with 0 =< b =< 2
dii) decide the b-value which gives the mean (? expectancy?) E(X|Y=b)=2
