Question

Choose the all correct things Sn=X1+X2+...+Xn 1. E[Sn]=2n, when RV X1,...,Xn is iid and E[X]=2 2....

Choose the all correct things

Sn=X1+X2+...+Xn

1. E[Sn]=2n, when RV X1,...,Xn is iid and E[X]=2

2. VAR[Sn]=3n, when RV X1,...,Xn is iid and VAR[X]=3

3. VAR[Sn]=2n is always correct, when RV X1,...,Xn is identically distributed and VAR[X]=2

4 .Sn is an Exponential distribution with a mean of 2n and a variance of 3n ,when RV X1,...,Xn is iid and E[X]=2, VAR[X]=3 Exponential distribution

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