Thanks!

I have another question:

*You are to take a multiple-choice exam consisting of 100 questions with five possible responses to each. Suppose that you have not studied and so must guess (select one of the five answers in a completely random fashion) on each question. Let r.v. *

*X **represent the number of correct responses on the exam.*

*Specify the probability distribution of **X.*

*-----------------------------------------------------------------*

I'm not sure what the distribution would look like. Would it be 1/500 for answering 1 question correctly, 2/500 for 2 correct, etc.? In other words x/500 for x = 1, 2, ... , 100???