How statistics and probability practice works
Each page in this series holds one topic from the ACT Math test. The list on the left shows every question in the pool; the number tile turns green once you have checked a question, and a saved question is easy to find again with the Bookmarked filter.
- Pick a question. Use the list, the search box or the difficulty filter, or just press Next question to go in order.
- Answer it. One problem at a time with four answer choices. Some official ACT Math questions share a graph or chart; calculators are permitted only on Math.
- Check your answer. Your result shows every choice marked, your pick, the correct option and a short explanation of why.
- Try it again or move on. A question you got wrong is worth a second attempt after you have read the explanation.
Prefer a short set with a score at the end? Build a statistics and probability set of 5, 10 or 20 questions, timed or untimed.
What statistics and probability covers on the ACT
On the ACT Math test, Statistics and Probability questions map to Preparing for Higher Math. Our practice results show raw accuracy for this category so you can identify a skill to revisit. Official ACT reports use their own scoring method.
How to approach statistics and probability
For averages, identify the total and the number of values. For probability, write the favorable outcomes over all possible outcomes and watch for “and,” “or” and conditional wording.
Before you move on: A probability should be between zero and one. Recheck the denominator if the result falls outside that range.
The 50 questions here cover 50 skills, including:
- Mean
- Median of an even number of values
- Mode from a frequency table
- Range with negative values
- Simple probability
- Complement of an event
- Reading a bar graph
- Fundamental counting principle
- Missing value for a target mean
- Median from a dot plot
- Adding a constant: effect on mean and standard deviation
- Probability from a table
This pool has 17 questions labelled easy, 17 medium and 16 hard by our team. These are practice labels, not official ACT difficulty ratings. Filter when you want to warm up or stretch. All 50 questions are available to practice.
Tips for statistics and probability questions
- Write down what the question asks for before you calculate. Many wrong answers are correct values for a different quantity.
- Estimate first. If the choices are far apart, a quick estimate rules out two or three of them.
- Plug the answer choices back in when the algebra gets long; the ACT rewards whatever method is fastest and correct.
- Check units and signs at the end. A negative that should be positive is easy to overlook.