random variables x and y are independent if the value of x does not affect the value of y. If the variables are notindependent, they are dependent. A new random variable can be formed by finding the sum or difference of random variables. If a random variable x has mean x and a random variable y has mean y then the means of the sum and difference of the variables are given by the following equations.

x+y=x+y

xy=xy

The distribution of atest's scores forcollege-bound male seniors has a mean of 1522 and a standard deviation of 310. The distribution of atest's scores forcollege-bound female seniors has a mean of 1492 and a standard deviation of 306. One male and one female are randomly selected. Assume their scores are independent.

What is the average sum of theirscores? What is the average difference of theirscores?

What is the average sum of theirscores?

nothing

(Type an integer or adecimal.)