A test consists of 10 questions. Each question has five options (A-E). To pass the test a student must answer at least 7 questions correctly. a. How many ways you can get 7 correct answers?

b. If a student guesses on each question, what is the probability that the student will get 5 correct answers?

c. If a student guesses on each question, what is the probability that the student will pass the test? 4

d. Find the mean and standard deviation?

e. If a student guesses on each question, is it usual for him/her to get 5 correct answers? Explain your answer.