Answer:
Random Variables
A random variable, usually written X, is a variable whose possible values are numerical outcomes of a random phenomenon. There are two types of random variables, discrete and continuous.
Discrete Random Variables
A discrete random variable is one which may take on only a countable number of distinct values such as Discrete random variables are usually (but not necessarily) counts. If a random variable can take only a finite number of distinct values, then it must be discrete. Examples of discrete random variables include the number of children in a family, the Friday night attendance at a cinema, the number of patients in a doctor's surgery, the number of defective light bulbs in a box of ten.
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Remember that Probability is a situation that is likely to happen and it lies between 0 to 1. In probability distribution , It is distributed from 1 to many different values. Hence , When we add all of it, The result will always be equal to 1.
