Which of the following is a discrete random variable?
A)The number of times a student guesses the answers to questions on a certain test
B)The amount of gasoline purchased by a customer
C)The amount of mercury found in fish caught in the Gulf of Mexico
D)The height of water-oak trees

Question

Quizplus · Accepted Answer

A discrete random variable is one that can only take a finite or countably infinite set of values. In this case, the number of times a student guesses answers on a test can only take on specific whole numbers, making it a discrete random variable. The other options (gasoline purchased, amount of mercury, height of trees) can take on any range of continuous values and are therefore not discrete random variables.

Which of the Following Is a Discrete Random Variable