The second question about the distribution of random answers to the test is literally incoherent. They probably meant to ask a question about the expected number of random answers on a randomly completed test, but they worded it such that they are asking about the distribution of answers on a single test.
They probably mean for you to assume that 1) each question has 5 answer choices, and 2) you select one of them with equal probability. But given that this is question #2, assumption (1) is kind of a guess, and (2) should be explicitly stated... (the answer btw has to do with the binomial distribution - and you definitely need some heavy arithmetic, so are they testing your gut instinct?)
> Assuming that every question in this 20-question test has only 1 right answer and you choose to guess the answer of each question randomly, then in terms of the number of correctly-guessed answers, approximately 68% of them will fall between:
> A. 2.2 and 5.8
> B. 0.8 and 7.2
> C. 6.8 and 12.5
> D. 7 and 13
> E. None of the above
Another messed up question was the one early on asking whether the dot product operator is "associative/commutative on addition" or not. That's not a thing that actually means something.