Histograms, box plots, mean, median & standard deviation — hover for details
The mean is the average — sensitive to outliers. The median is the middle value — more robust. Standard deviation (σ) measures spread from the mean. A box plot shows the five-number summary: min, Q1, median, Q3, max, with outliers beyond 1.5×IQR. The normal distribution (bell curve) arises from the central limit theorem. Skewness measures asymmetry: positive = right tail, negative = left tail.