if we let X be a (continous or discrete) random variable with range Rx[-a,a] how can we find Var(X) which is less or equal than a^2??
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Originally Posted by xixihaha if we let X be a (continous or discrete) random variable with range Rx[-a,a] how can we find Var(X) which is less or equal than a^2?? Please post the entire question, not just your version of it. $\displaystyle Var(X) = E(X^2) - [E(X)]^2$.
that is the entire question. here is the exactly the question from my sheet: Let X be a (discrete or continuous) random variable with range Rx[-a,a]. Show that Var(X) =< a^2.
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