A multiple-choice examination has 11 questions, each with five possible answers, only one of which is correct. Suppose that one of the students who takes the examination answers each of the questions with an independent random guess. What is the probability that he answers at least six questions correctly? O a. 0.1064 b. 0.2117 OC. 0.0117 4 Od. 0.3064 Oe. 0.3117

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