You guess repeatedly on an exam that is made up of multiple choice questions, all of which have 4 possible answers.

There are 27 problems on the exam.

If needed, round your answers below to three decimals.

a. To model this situation with a binomial distribution, what would you use forp?

b. How many questions would you expect to get right?

c. What is the variance?

d. What is the probability of getting 7 questions right

I am mainly having trouble with part c and d.