GRADE	COUNT
A	10
B	2
C	2
D	2
F	4
Total	20

Q25.If the records show that, the probability of failing (with gradeF) this course isp, [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 gradeB this course isp, [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 gradeB for the course? {Hint:

use binomial distribution}

Q27.What is the probability of selecting a gradeA student for the first time either in 2nd or 3rd selection?{Hint: use Geometric distribution with p value as the answer for question 18}