Question: A multiple choice test has 20 questions. There are five possible answers to each question, where only one is correct. If X is the number

A multiple choice test has 20 questions. There are five possible answers to each question, where only one is correct. If X is "the number of questions a student guesses correctly", find: a the distribution of X b the mean and variance of XE c the probability that, if a student answers the test purely by guessing, they will achieve the pass mark of 10 or more

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