What can be considered a discrete random variable

This week’s required readings explain the role that discrete random variables and their discrete probability distributions play in the world of statistical analysis. Consider the following questions and respond in a minimum of 175 words:
What can be considered a discrete random variable? Explain why. Are there any restrictions? What are some examples?
Would you consider the majority of variables in life to be discrete random variables or some other type? Justify your answer. How does this impact understanding and predicting what might happen in the future?
What is a probability distribution for a discrete random variable? What does it look like?
Ninety-five percent of students pass the introductory statistics course on the first try. A group of 40 students who have taken the introductory statistics course is randomly selected. Give two reasons why this is a binomial problem.