The distribution is a probability distribution, and the reasons are 
- The given distribution is a probability distribution, since the probabilities lie inclusively between 0 and 1. 
- The given distribution is a probability distribution, since the sum of probabilities is equal to 1. 
How to determine whether the distribution is a probability distribution?
The probability distribution is given as:
X     0   1    2 
P(X) 0 1/3 2/3 
From the above table of probability distribution, we can see that each probability value is between 0 and 1 (inclusive)
Also, the sum of probabilities is 1
i.e. 0 + 1/3 + 2/3 = 1
Hence, the distribution is a probability distribution, and the reasons are 
- The given distribution is a probability distribution, since the probabilities lie inclusively between 0 and 1. 
- The given distribution is a probability distribution, since the sum of probabilities is equal to 1. 
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