Question I.2: A study of a company's practice regarding the payment of invoices revealed that, on average, an invoice was paid 20 days after it was received. The standard deviation was 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? 100% 91% 13% 74%

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Question I.2: A study of a company's practice regarding the payment of invoices revealed that, on average, an invoice was paid 20 days after it was received. The standard deviation was 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?

  1. 100%
  2. 91%
  3. 13%
  4. 74%
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