Question 1075791: On a 10 question multiple choice test (5 possible answers for each question), what is the probability of guessing at least 1 correct answer?
Originally, I did 5 C 1, but it's probability, which means it needs to be a fraction. I was thinking I needed to find the probability of getting all of them wrong, and then subtracting that from 1.
Answer by jorel1380(3719)   (Show Source):
You can put this solution on YOUR website! Out of 5 possible answers for each question, 4 are wrong. So the probability of getting all questions wrong is .8^10, or 0.1073741824. The probability of getting at least one right is 1-0.1073741824, or 0.8926258176, or an 89.26258176% chance. ☺☺☺☺
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