What is the standard deviation of the difference of their scores? The distribution of SAT scores for

Question:

What is the standard deviation of the difference of their scores?
The of SAT scores for college-bound male seniors has a mean of 1512 and a standard deviation of 322. The of SAT scores for college-bound female seniors has a mean of 1486 and a standard deviation of 311. One male and one female are randomly selected. Assume their scores are independent.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...