domingo, 5 de octubre de 2008

Medidas de Tendencia Central

xi= 245, 228, 221, 218, 207, 201, 199,
196, 190, 183, 180, 178, 175, 174, 163,
160, 157, 154, 153, 151, 134, 131, 105, 97.


Media

\bar{X}_n = T(X_1,X_2,...,X_n) = \frac{1}{n} \sum_{i=1}^n X_i = \frac{X_1+X_2+...+X_n}{n}

= 4354/25

=174.16

Mediana


M_e=x_{\frac {(n+1)} {2}}

= (25 +1)/2

=26/2

=13vo lugar ; 175




Moda= 154

Rango= 245 - 97 = 148


Varianza


s ^ 2(x) = \frac{1}{n} \sum_{i=1}^n \left( x_i - \overline{x} \right) ^ 2 \,\!

=31889.8/26
s2=1226.53
s=35.02











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