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8. Un tesorero se dio cuenta de que, en promedio, el saldo semanal en bancos es de $345 000.00, con una desvia- cion estandar de

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8. Un tesorero se dio cuenta de que, en promedio, el saldo semanal en bancos es de $345 000.00, con una desvia- cion estandar de $10500.00. Si sabe por experiencia que los saldos tienen una distribucion normal, determine que porcentaje de semanas tienen un saldo menor a $320 000.00

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