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9.- En una distribucin normal con media de 120 y desviacin estndar de 30,0 existen 300 observaciones entre 130 y 150. Cuntas observaciones existen entre
9.- En una distribucin normal con media de 120 y desviacin estndar de 30,0 existen 300 observaciones entre 130 y 150. Cuntas observaciones existen entre 130 y 145?
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