Number of heads obtained
1. Three coins are tossed. Let X be the number of heads obtained. The probability distribution for X if given: X 0 1 2 3
P(X=x) 1/8 3/8 3/8 1/8
Find mean and standard deviation of X by hand.
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Three coins are tossed. Let X be the number of heads obtained. The probability distribution for X if given: X 0 1 2 3. P(X=x) 1/8 3/8 3/8 1/8
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