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n
x⁻ = 1/n * ∑ (ai)
i=1
x 2 3 4 5 6 7 8 9
f 5 2 0 4 3 5 2 4
10 6 0 20 18 35 16 36
10 + 6 + 0 + 20 + 18 + 35 + 16 + 36 = 141
n = 5 + 2 + 0 + 4 + 3 + 5 + 2 + 4
n = 25
x⁻ = 141 / 25
x⁻ = 5,64 Media aritmética
Desviación media:
D = 1/n (∑⊥xi - x⁻⊥fi
(2-5,64)(5) + (3-5,64)(2) + (5-5,64)(4) + (6-5,64)(3) + (7-5,64)(5) + (8-5,64)(2) + (9-5,64)(9) =
(3,64)(5) + (2,64)(2) + (0,64)(4) + (1,64)(3) + (2,64)(5) + (3,64)(2) + (4,64)(9) = 93,2
D = 93,2 / 25
D = 3,728