a multiple-choice test has 30 questions. each question has 5 choices. if you guess at random on all the questions, what are the expected value (ev) and standard error (se) of the number of correct answers on your test? what is the expected value of the number of correct answers on your test? (a) 15 (b) 7 (c) 6 (d) 4 what is standard error (se) of the number of correct answers on your test? (a) 2.19 (b) 4.9 (c) 24 (d) 4.8