The internal auditor for your company believes that 10 percent of your invoices contain errors. To check this theory, 20 invoices are randomly selected, and 5 are found to have errors. What is the probability that of the 20 invoices selected, 5 or more would contain errors if the theory is valid?
A) .0433
B) .0319
C) .9567
D) .8660

Question

Quizplus · Accepted Answer

P(x ≥ 5) = .0319 + .0089 + .0020 + .0004 + .0001 = .0433

The Internal Auditor for Your Company Believes That 10 Percent