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AP Statistics / Unit 2

Unit 2 · 15–25%

Probability, Random Variables, and Probability Distributions

Use chance models to say how often outcomes should appear in the long run.

Start first lessonUnit practice

Topics

  • Addition and multiplication rules
  • Conditional probability
  • Discrete random variables
  • Expected value and variance
  • Binomial and geometric settings

Lessons

Key terms

Original practice

Marlow Works questions. If this unit does not have its own items yet, you will see other questions from the same course.

1 of 1Probability, Random Variables, and Probability Distributions · medium · short answer

A fair spinner has four equal sectors labeled A, B, C, and D. What is P(A or B)? Show brief reasoning.

Original Marlow Works item — not a College Board question.

Take your time—this is practice, not a test.

Review checklist

  1. 01State whether events are disjoint, independent, or neither.
  2. 02Define the random variable in words before computing.
  3. 03Check binomial or geometric conditions before using the formula.

Related resources

External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.

  • Official / link only

    AP Statistics course page

    Official revised 2026–27 five-unit framework.

    College Board · All rights reserved · accessed 2026-10-01

    Open source

  • CC BY — attribution required

    Collaborative Statistics

    Open statistics text for distributions, probability, and inference.

    Open Textbook Library listing · CC BY · accessed 2026-10-01

    Open source