what is the pmf what is pmf? what is the value of the pmf what is the pmf value for this data model what is a probability function used to evaluate a discrete variable? when is pmf evaluated what is pmf what is the pmf value for x how to determine probability of a random variable what is pmf in probability why do you use pmf what is pmf what is x in pmf what is pmf evaluation what is pmf calculating which function does pmf how to evaluate probability mass function what is the pmf function? what is probability in probability? what is the evaluative method of the pmf