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If X denotes the number on the upper face of a cubical die when it is thrown, find the mean of X

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If X denotes the number on the upper face of a cubical die when it is thrown, find the mean of X

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The sample space of the experiment consist of 6 elementary events where, xi = 1, 2, 3, 4, 5, 6

The random variable X i.e. number on the upper face of a cubical die when it is thrown is -1, 2, 3, 4, 5, 6

The probability distribution of X is

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