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A true/false test has 20 questions. If a student is simply guessing at the answers, On average, how many questions would a student answer correctly

A true/false test has 20 questions. If a student is simply guessing at the answers,

On average, how many questions would a student answer correctly for the entire test?
What is the probability that a student would answer more than 15 questions correctly simply by guessing?
What is the probability that a student would answer fewer than 7 questions correctly simply by guessing?

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