times student will get 3 out of 10 questions right randomly guessing 4 choice questions
This is a binomial distribution, where p=1/4=0.25, the chance of getting the correct answer, and 1-p=0.75, the chance of getting the wrong answer. The distribution's last 4 terms are:
(1-p)^10, 10(1-p)^9p, 45(1-p)^8p^2, 120(1-p)^7p ^3.
These represent the chances of 0, 1, 2, 3&n Read More: ...