Statistics & Probability - Overview

The Statistics & Probability domain focuses on data analysis, probability, counting methods, and interpreting information presented in tables and graphs.

Many ACT questions in this domain emphasize reasoning and interpretation rather than lengthy calculations.

TipWhat You’ll Learn

By working through this domain, you’ll learn how to:

  • Analyze data sets
  • Interpret tables and graphs
  • Calculate probabilities
  • Understand counting principles
  • Work with averages and variability
  • Evaluate statistical conclusions
  • Distinguish correlation from causation

Course Structure

Topics in this domain include:

  • Mean, median, mode, and range
  • Weighted averages
  • Standard deviation concepts
  • Boxplots
  • Data interpretation
  • Probability
  • Independent and dependent events
  • Counting principles
  • Two-way tables
  • Scatterplots
  • Correlation and causation

ACT Statistics & Probability Tips

  • Read graphs before calculating.
  • Check scales and units carefully.
  • Distinguish probability from counting.
  • Understand what statistical measures represent.
  • Watch for misleading conclusions from data.

Assess Your Progress

After completing the lessons, reinforce your understanding through:

  • Lesson practice questions
  • Unit assessments
  • ACT Domain Tests
  • Full-Length ACT Practice Tests

Select a topic from the sidebar to begin.