If X and Y are independent continuous random variables with…

If X and Y are independent continuous random variables with variances 2 and 3 and expectation 3 and 5, then which of the following is/are true (1) Var(X+Y) = 5 (2) E(XY)=15 (3) Can only calculate var(X+Y) for discrete random variables (4) insufficient data to calculate var(X+Y) 

Grace is graduating from college and she has been offered tw…

Grace is graduating from college and she has been offered two jobs: one in San Diego and another in San Francisco. Grace will consider the number of crimes occurring per 100,000 people in each city to determine which job she will take. Grace is using the __________.