The third requirement is that each of the probabilities added together must equal 1. And we have that here, so there's the second requirement. There just needs to be a probability value assigned to each random variable. The associations don't need to be unique you could have the same probability value for more than one random variable. Notice that in this case for random variables x=2 and x=3, we have the same probability value. And we can see that each random variable has an associated probability with it. The second requirement is that a probability value must be assigned to each random variable. And we can see here that each one of these values in the probability column is between 0 & 1 inclusive. So let's check these requirements off.įirst, the probabilities that are listed in our table have to be between 0 & 1 inclusive.
And the third requirement is that the probabilities in the table must add up to equal 1. The second requirement is that each of the values for random variables must have a probability associated with it.
The first requirement is that each of the probability values in the probability table must be a probability value, which means they must be between 0 & 1 inclusive.
Our first question reads, “Does the table show a probability distribution? Select all that apply.” To check the values in our probability table to see if we have a probability distribution, we must ascertain that three requirements are met.
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