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TEAS MathematicsCenter, spread & chance

Data, Statistics & ProbabilityATI TEAS 7 cheat sheet

Center, spread & chance

11 key facts 1 practice questions Reviewed Oct 2026
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Measures Of Center

  • Mean = add all ÷ how many (the average)
  • Median = the MIDDLE value when ordered
  • Mode = the value that appears MOST
  • Range = highest − lowest

Reading Graphs

  • Bar graph = compare categories
  • Line graph = change over time
  • Pie chart = parts of a whole (adds to 100%)
  • Always read the title, axes, and legend first

Probability

  • P = favorable outcomes ÷ total outcomes
  • 0 = impossible, 1 = certain
  • Rolling a 4 on a die = 1/6
Key takeaway

Center, spread & chance

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Test yourself first: 1 question

Question 1 of 1

Find the range of the data set: 12, 7, 20, 5, 15.

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