Question:medium

In a shelf there are three mathematics and two physics books. A student takes a book randomly. If he randomly takes, successively for three times by replacing the book already taken every time, then the mean of the number of mathematics books which is treated as random variable is

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Recognizing the type of probability distribution is the key to solving such problems quickly. Look for the characteristics of a binomial distribution: fixed number of independent trials, only two outcomes per trial, and constant probability of success. The mean is simply $np$.

Updated On: Mar 30, 2026

3/2
129/125
9/5
174/125

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The Correct Option is C

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