Probability, Probability Distributions, Data Science, Machine Learning, Probability Theory.
a very simple case. Suppose we throw a 6 sided fair dice and let X be our random variable which takes the values that we get after each throw. So X can take the values 1,2,3,4,5,6. Note that this is a discrete random variable. Let f(X) denote the probability that X = x [x = 1,2,3,4,5,6]. In this