1. A random sample of size n is to be drawn from a population with = 1500 and = 200 What size sample would be necessary in order to reduce the standard error to 25?

2.Consider the probability distribution shown here

X: 7 9 11

p(x) 1/3. 1/3. 1/3

Let be the sample mean for random samples of n = 2 measure ments from this distributi on. Find E(x) and E( ).