Descriptive-statistics practice with computed, always-correct answers — mean, median, and mode, range and standard deviation, weighted and combined averages, the effect of outliers, correlation direction, and reading a dataset. Difficulty scales from a quick average to variance and multi-group means, and each wrong option is a classic confusion (median vs mean, variance vs standard deviation, range vs midrange). Complements Probabilistic Reasoning (chance) and Data Interpretation (charts); aligned to AP Statistics and the data sections of the SAT, GRE, and GMAT.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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