Normal Distribution Explorer
An interactive visualisation of the normal distribution with draggable parameters (μ and σ) and historical overlays tracing how the bell curve has been used — and misused — to classify human populations, from Quetelet's "average man" to IQ scoring and benefit thresholds.
μ0.00σ1.00
Drag the blue dot to shift μ · drag the green dot to adjust σ · or focus anywhere in the chart area and use ←→ for μ, ↑↓ for σ
Show text description
Normal distribution curve with mean μ = 0.00 and standard deviation σ = 1.00. The peak (mode) occurs at x = 0.00 with probability density 0.3989. 68% of values lie between -1.00 and 1.00. No historical overlays active.