Quantitative SAT scores have a mean of 500 and a standard deviation of 100, while ACT scores

Question:

Quantitative SAT scores have a mean of 500 and a standard deviation of 100, while ACT scores have a mean of 21 and a standard deviation of 5. Assuming both types of scores have distributions that are unimodal and symmetric, which is more unusual: a quantitative SAT score of 750 or an ACT score of 28? Show your work.