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Chelsea is taking her MATH 1227 exam is presented with 30 multiple choice ques- tions, each with 5 different answers. On any given question she

Chelsea is taking her MATH 1227 exam is presented with 30 multiple choice ques- tions, each with 5 different answers. On any given question she knows the answer with prob- ability 0.5. If she does not know the answer, then she guesses randomly (she may guess the correct answer or she may guess the wrong answer). Write an expression for the probability that Chelsea gets at least 29 questions correct on her exam.

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