Given that events $A$ and $B$ are independent with $Pr (A) = 0.4$ and $Pr (B) = 0.5$ , find $Pr (A^{'} \cup B^{'})$ .

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The random variable $X$ has a binomial distribution $X \sim Bi (n = 10, p = 0.2)$ . The standard deviation of $X$ is:
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