GRE Subject 2026 Practice Test Maths Probability Theory Free Quiz 1

1. What is the range of probability?

A. -1 to 1 B. 0 to 100 C. 0 to 1 D. 0 to ∞

2. What type of random variable takes countable values?

A. Continuous B. Discrete C. Infinite D. Finite

3. What type of random variable takes uncountable values?

A. Continuous B. Discrete C. Countable D. Infinite

4. What function is used for discrete random variables?

A. Continuous B. Cumulative C. Probability mass function D. Density function

5. What is the expected value of a random variable?

A. Variance B. Expected value C. Standard deviation D. Mode

6. What does the variance measure?

A. Variance B. Standard deviation C. Covariance D. Correlation

7. What is the standard deviation?

A. Variance B. Mean C. Standard deviation D. Covariance

8. What defines mutually exclusive events?

A. Independent B. Mutually exclusive C. Dependent D. Conditional

9. What theorem relates conditional probabilities?

A. Multiplication rule B. Addition rule C. Bayes' theorem D. Complement rule

10. What distribution models the number of successes in n trials?

A. Poisson B. Normal C. Exponential D. Binomial