y=(x1+x2+x3)/3
x1 = x2 = x3 = mu
y=(mu+mu+mu)/3
y=3mu/3=mu
or can you not do that because you don't know if they are independent or not?
and no, I don't notes on that - trust me, I looked before I posted.
Let X1, X2, X3 be three random variables. Suppose all three have mean μ and variance 1. The sample mean is Y = (X1 +X2 +X3)/3.
(a) Can you compute the mean of Y? If so, what is it? If not, why not?
I have that it is either μ OR that it is not possible to find, since we don't know if they...