Calculadora de Desviación Estándar (3 valores) — Fórmula

Standard Deviation

Formula

Population SD = sqrt(sum of (xᵢ - mean)² / N)

Sample SD = sqrt(sum of (xᵢ - mean)² / (N-1))

Steps

1. Calculate the mean (average) 2. Find each value's deviation from the mean 3. Square each deviation 4. Average the squared deviations (divide by N for population, N-1 for sample) 5. Take the square root

Ejemplo Resuelto

Find the standard deviation of 10, 20, 30.

  1. Mean = (10+20+30)/3 = 20
  2. Deviations: -10, 0, +10
  3. Squared: 100, 0, 100
  4. Variance = (100+0+100)/3 ≈ 66.67
  5. Std Dev = √66.67 ≈ 8.1650