For TEAS data questions, the mean is the total divided by the count, the median is the middle of the ordered values, the mode is the most frequent value and the range is the greatest minus the least. This free lab generates small datasets as a bar chart and a table, checks each answer and shows what one outlier does.
Use this dataset as the example: 4, 7, 7, 9, 13.
Order the values, then average the two in the middle. With 6 values, average the 3rd and 4th; ATI’s own example uses 10 values and averages the 5th and 6th. Always sort first: the middle of an unsorted list is not the median.
An outlier is a value far from the rest. It pulls the mean toward it, because the mean uses the size of every value, but the median barely moves, because it only depends on the middle position. For 4, 7, 7, 9, 13, the mean is 8 and the median is 7. Add 60 and the mean jumps to 100 ÷ 6 ≈ 16.7, while the median only moves to 8.
Read the title and the axis labels first, then trace the top of each bar across to the scale. “How many more” means subtract. Check whether the vertical axis starts at zero: a cut-off axis makes small differences look large. A graph that shows two things rising together does not prove one causes the other.
The TEAS 7 Math section has 38 questions in 57 minutes, and 34 of them are scored. ATI groups the scored math questions into Numbers and Algebra (18) and Measurement and Data (16). Data displays and descriptive statistics belong to Measurement and Data, and the Reading and Science blueprints also include reading information from graphs and tables.
The mean is the total divided by the count. The median is the middle value after ordering. An outlier changes the mean much more than the median.
Yes. If every value appears once, there is no mode. If two values tie for most frequent, both are modes.
Order the values and average the two middle ones. For 3, 5, 8, 10, the median is (5 + 8) ÷ 2 = 6.5.
How spread out the data are: the greatest value minus the least. It says nothing about where most values sit.
Yes. ATI says a basic on-screen calculator is built into the exam and is available on every question in every section. It adds, subtracts, multiplies and divides, and has percent, square root, decimal point, backspace and memory keys. It is not a scientific or graphing calculator, and personal, phone and watch calculators are not allowed.
Facts checked 2026-10-25. Practice items and data in this lab are original and invented; they are not real TEAS questions.
TEASPATH is independent of ATI. ATI TEAS® and TEAS® are registered trademarks of Assessment Technologies Institute, L.L.C., which is not affiliated with and does not endorse TEASPATH. Practice results are not official scores or admission predictions.
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