Choose the correct alternative : X: is number obtained on upper most face when a fair die….thrown then E(X) = _______.

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X : number obtained on upper most face. ∴ Possible values of X are {1, 2, 3, 4, 5, 6} ∴ P(X = x) = (1)/(6), for x = 1, 2, ..., 6 ∴ E(X) = \sum\limits_{x=1}^{6} x	ext{P}(x) = `(1 xx 1)/(6) + (2 xx 1)/(6) + (3 xx 1)/(6) + (4 xx 1)/(6) + (5 xx 1)/(6) + (6 xx 1)/(6)` = 3.5

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