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

Question:

What is the standard deviation of the difference of their scores?

The distribution of SAT mathematics scores for college-bound male seniors in 2016 has a mean of 524 and a standard deviation of 126. The distribution of SAT mathematics scores for college-bound female seniors in 2016 has a mean of 494 and a standard deviation of 116. 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...

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