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

Multiple Choice

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%