A population consists of 4 numbers, 1,3,3,5

a. find mean and STD- which i have done

b. exhibit the population of the means of all samples of two from the original population. note that an element may be selected twice and that there are two 3s.

I can not understand what to do for B. I think I may just be making it more difficult then it has to be.

Anyone know the steps to take to get to the answer???? pleaseeeeee