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Quartiles divide sorted data into four equal parts: Q1 (25th percentile), Q2 (median, 50th), Q3 (75th). IQR = Q3−Q1; outliers > Q3+1.5×IQR or < Q1−1.5×IQR. Skewness measures distribution asymmetry (0 = symmetric). Kurtosis measures tail heaviness (3 = normal distribution). Z-score = (value − mean) / SD tells you how many standard deviations from the mean a value falls.
Mean: 3.000000
Sample SD: 1.581139