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Una tienda departamental ofrece a sus clientes sus compras a crdito, para lo cual se tom una muestra aleatoria de 27 personas y se mostr

"Una tienda departamental ofrece a sus clientes sus compras a crdito, para lo cual se tom una muestra aleatoria de 27 personas y se mostr que en promedio deben $ 13,167.00, y la desviacin estndar es de $ 520.00.Construya un intervalo de confianza del 90% para el promedio de los saldos en mora de los clientes con pago a crdito."

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