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Posted on Jun 21, 2024

Suppose there are 12 multiple choice questions in an English class quiz. Each question has five possible answers, and only one of them is correct.

Suppose there are 12 multiple choice questions in an English class quiz. Each question has five possible answers, and only one of them is correct. Find the probability of having four or less correct answers if a student attempts to answer every question at random. Find mean and variance of the random variable. (Ans: 92.7%). Find the mean and variance of the distribution.

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