Matori

If you get a "compute the covariance" or "compute the standard deviation" question where you just have a data set and you have to do all the different calculations, I would honestly suggest skipping the question and coming back to it later. The time saved will likely be better spent elsewhere, even if it means guessing on that one.

And I suggest doing that even if you know how to do it. The only exception is if there is some trick you can see to solve the question quickly, or there are only a *very* few data points.