Thread: random variables and variance

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??

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.

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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.