Please help me understand what this means, how I am supposed to do this.

From the x row, select without replacement and list a samples of a size n=2

X 1 2 3 4

P(x) 1/4 1/4 1/4 1/4

Calculate for each sample and list the unique values. Construct a sampling distribution for . For the sampling distribution find and stand .

Any idea how to do this? I am so lost. Even if you can help with just a part of it, it would be much appreciated. Thanks