Question: Suppose that two random variables X and Y have the joint probability distribution given in the table.
Find the expected values and variances of the random variables X, Y, X + Y and X - Y.

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?