Random variable X has probability distribution x_______________1________2_______3________4_______ 5 P(X=x)________0.10_____0.15_____0.20_____0.25_____ 0.30 E(X)= 3.5 Var(X)= 0.95 Find Var(3-2X) Please help!
Last edited by mr fantastic; May 5th 2009 at 07:57 AM. Reason: Merged posts
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Originally Posted by greghunter sorry that didn't work Random variable X has probability distribution x_______________1________2_______3________4_______ 5 P(X=x)________0.10_____0.15_____0.20_____0.25_____ 0.30 E(X)= 3.5 Var(X)= 0.95 Find Var(3-2X) Please help! Use Var(aX + b) = a^2 Var(X). Note: I haven't checked your calculations for E(X) and Var(X).
Originally Posted by greghunter sorry that didn't work Random variable X has probability distribution x_______________1________2_______3________4_______ 5 P(X=x)________0.10_____0.15_____0.20_____0.25_____ 0.30 E(X)= 3.5 Var(X)= 0.95 Find Var(3-2X) Please help! After that just solve accordingly
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