Median: middle value of sorted data (average of two middles if even n).
Mode: most frequent value(s); if all unique → “No mode”.
Range: max − min
Quartiles (Tukey): Q1 = median of lower half; Q2 = median; Q3 = median of upper half.
IQR: Q3 − Q1
Variance (Population): Σ(x−μ)² / n; Std Dev = √Variance.
Variance (Sample): Σ(x−x̄)² / (n−1) (shown only if n ≥ 2).
Input tips: use commas, spaces, tabs, or newlines. Supports -3.5, 1.2e3, etc.
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