can anybody help solve this please

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- Apr 29th 2009, 11:42 AMarslanfinding the standard deviation of the variable????
can anybody help solve this please

- Apr 29th 2009, 11:52 AMMoo
- Apr 30th 2009, 04:54 AMarslan
- Apr 30th 2009, 06:15 AMmr fantastic
E(X + Y) = E(X) + E(Y) is easily proved from the definition of expected value.

For the proof of Var(X + Y) = Var(X) + Var(Y), read this: Variance of the Sum of Two Independent Random Variables