Compute the mean of this probability distribution

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Q. Quantitative methods The subsequent is the probability distribution for a random variable X, where X is the number of heads which will be obtained in a simultaneous toss of two fair coins: Number of heads Probability P(X) 0 ¼ 1 ½ 2 ¼ 1.0 a. Compute the mean of this probability distribution b. Compute the standard deviation of this probability distribution c. Compute the expected value of the random variable?

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