**Plot the probability mass function of the sample mean of X1, ...,Xn, when**

a) n = 2;

a) n = 3.

Assume that the probability mass function of the sample mean of X1,...,Xn is

P{X = 0} = .2, P{X = 1} = .3, P{X = 3} = .5

The answer in the back of the book is

a) n = 2;

a) n = 3.

Assume that the probability mass function of the sample mean of X1,...,Xn is

P{X = 0} = .2, P{X = 1} = .3, P{X = 3} = .5

**Any help is appreciated.**

E[sample mean] = 1.8

V[Sample mean] = 4.8/n

E[sample mean] = 1.8

V[Sample mean] = 4.8/n