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l₂ = 866 cm
l₃ = 865,5 cm
l₄ = 866,5 cm
Najlepszym przybliżeniem będzie średnia arytmetyczna:
l_s = (l₁ + l₂ + l₃ + l₄)/4 = (865 + 866 + 865,5 + 866,5)/4 = 3463/4 = 865,75
odchylenie standardowe
s = pierwiastek(1/(n-1) * [(l_s - l₁)² + (l_s - l₂)² + (l_s - l₃)² + (l_s - l₄)²] = pierwiastek(1/3 * [(0,75)² + (-0,25)² + (0,25)² + (-0,75)²]) = pierwiastek(1/3 * [0,5625 + 0,0625 + 0,0625 + 0,5625]) = pierwiastek(1/3 * 1,25) ≈ 0,645
l = 865,75 ± 0,645 cm