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Se evala el acabado superficial de 40 muestras de cinta magntica y se obtienen los resultados siguientes: Nmero de defectos 0 1 2 3 4

  1. Se evala el acabado superficial de 40 muestras de cinta magntica y se obtienen los resultados siguientes:

Nmero de defectos

0

1

2

3

4

5

Nmero de muestras

18

12

7

2

1

0

Determine la media y la varianza del nmero de defectos por muestra de cinta.

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