A student takes a 25 question multiple choice eam. Each question has 3 choices for each question. The student is unprepared and guesses on each question. Find the probability of getting 15 or more out of 25 problems correct?  Also: If there is a manner to use the TI-83 to solve, please advise. Best Regards, Sabrina Topp

A test has many multiple-choice items, each with five answer choices. A student receives 1 point for every correct answer, and each incorrect answer brings a penalty 1 (loss) of of a point. If Chris guesses on every question, what score can he expect on the test? 4 ..... Chris can expect to get a score of (Simplify your answer.)

Richard has been given a 12-question multiple-choice quiz in his history class. Each question has five answers, of which only one is correct. Since Richard has not attended the class recently, he doesn't know any of the answers. What is the value of n ?(n is the number of trials)

On a 10 question multiple-choice test, where each question has 5 answers, what would be the probability of getting at least one question wrong? Give your answer as a fraction