What is a discrete variable?

Answer 1

It is a variable that can take on only a finite number or COUNTABLE number of values, usually representing some type of categorical data or integral data ( data that can only be of type integer)

EX. X is a variable that represents the RANK in high school;

then X = {"freshman","sophmore","junior","senior"}

EX. How many cats do you have?

EX. How many doctors work at the hospital?

IN CONTRAST, a REAL variable or CONTINUOUS variable can take of fractional, decimal, and irrational values. EX. weight, price, age