Bill is taking a 10 question multiple choice exam. Each question has 5 answers, of which only one is correct. Since Bill has missed every class, he doesn't know any of the answers and decides to guess on all 10 questions. Find the probability that Bill will answer at least half of the questions correctly

Question

Mathematics

Zoey

14 September, 22:24

Bill is taking a 10 question multiple choice exam. Each question has 5 answers, of which only one is correct. Since Bill has missed every class, he doesn't know any of the answers and decides to guess on all 10 questions. Find the probability that Bill will answer at least half of the questions correctly

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Jeramiah Mendoza · Answer 1

Each answer has a 1:5 probability of getting it right. times 10 for ten questions, getting 10:50, an simplifying would bring us back to 1:5 meaning that you don't really even need to do the multiplying, i just did it to represent the 10 questions.