SOLUTION: A multiple-choice question on a quiz contains 10 questions with five possible answers each. What is the probability of randomly guessing the answers and getting exactly 9 questions

Algebra ->  Permutations -> SOLUTION: A multiple-choice question on a quiz contains 10 questions with five possible answers each. What is the probability of randomly guessing the answers and getting exactly 9 questions      Log On


   

Question 1143696: A multiple-choice question on a quiz contains 10 questions with five possible answers each. What is the probability of randomly guessing the answers and getting exactly 9 questions correct?
Answer by greenestamps(13209) About Me  (Show Source):
You can put this solution on YOUR website!


(a) Choose 9 of the 10 to be the ones that are correct
(b) Each correct answer has probability 1/5; each wrong answer has probability 4/5.

C%2810%2C9%29%2A%281%2F5%29%5E9%2A%284%2F5%29

Use a calculator....