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7. (Bennett&Briggs 2015, 7B) A class quiz comprises 10 multiehoiee questions, with 4 choices for each question and 1 point each for a total of

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7. (Bennett&Briggs 2015, 7B) A class quiz comprises 10 multiehoiee questions, with 4 choices for each question and 1 point each for a total of 10 points. Suppose you answer all question with a random strategy (randomly pick one out of the four Choices for all questions), what is the probability of getting at least 7 points? [5]

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