Question

1. A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?​

Answer 1

Meanm =20 Standard Deviations=5 Standard Normal Variable is given by Z= ( X -m ) /s = Z= ( X - 20 ) / 5 When X= 15, then Z= (15 - 20 ) / 5 =-1 The percent of the invoices were paid within 15 days of receipt is given by P ( X < 15 ) = P ( Z < -1 )...

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