Q25. If the records show that, the probability of failing (with grade F) this course is p, [use the answer to question 22 above as the probability, p, here], what is the probability that at most 2 students out of 20 fail this course? {Hint: use binomial distribution} Q26. If the records show that, the probability for a student to get a grade B this course is p, [use the answer to question 19 above as the probability, p, here], what is the probability that exactly 4 students out of 20 will have a grade B for the course? {Hint: use binomial distribution} Q27. What is the probability of selecting a grade A student for the first time either in 2nd or 3rd selection? {Hint: use Geometric distribution with p value as the answer for question 18}