Ok, I read the sticky post and here's the effort I already used
(btw, this isn't a homework problem, but a practice exam)
b) I honestly have no idea. I know that the expected value of a single random variable is the sum of x * probability. My best guess here would be a sumproduct between the row total and column totals (marginal properties)
c) I have the formula for covariance is E[X - meanx)(Y - meanx)] but I don't know where to get the mean for x and the mean for y b/c the probabilities shown are for joint events
d) Isn't this just the expected value * 2?