A study of a company's practice regarding the payment of invoices revealed that on the average an invoice was paid 20 days after it was received. The standard deviation equalled five days. A sample of
25 invoices is selected. Assuming that the distribution is normal, what percent of the sampled invoices were paid within 15 days of receipt?
A) 100%
B) 37.91%
C) 34.13%
D) 86.74%
E) None of the choices are correct

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The Answer of A study of a company's practice regarding the payment of invoices revealed that on the average an invoice was paid 20 days after it was received. The standard deviation equalled five days. A sample of
25 invoices is selected. Assuming that the distribution is normal, what percent of the sampled invoices were paid within 15 days of receipt?
A) 100%
B) 37.91%
C) 34.13%
D) 86.74%
E) None of the choices are correct

A Study of a Company's Practice Regarding the Payment of Invoices