Suppose that you have a fair coin, and you label the head side 1 and the tail side 0. Now, fake flipping the coin 2 times and write down the sampling distribution of the sample means. Repeat flipping the coin 4 times and 10 times.

What is it asking? The result in the book is

n=2 p=0.5

x P(X=x)

0 0.25

1 0.50

2 0.25

What does that mean? Thanks a lot.