Answer
It is a probability model.
Work Step by Step
All probability values are non-negative and between $0$ and $1$.
The sum of all is probabilities is $1$.
Thus, the given model is a probability model.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.