For this example consider the probability experiment of flipping two coins:

Yet this week we are considering random variables... so let our random variable count the number of heads, that is

So we can make our table of outcomes and frequencies as follows

Outcome (\(X\))	Frequency
0	1
1	2
2	1
Total:	4

Then we can take a frequencies for each outcome and divide by the total frequency and get out probabilities 

Outcome (\(X\))	Frequency	Probability \(P(x)\)
0	1	\(\frac{1}{4}=0.25\)
1	2	\(\frac{2}{4}=0.50\)
2	1	\(\frac{1}{4}=0.25\)
Total:	4

Then Graphing only these probabilities we get