For Exercises 4.14 and 4.15, see pages 180–181; for 4.16 to 4.20, see pages 183–184; for 4.21 to 4.23, see pages 185–186; for 4.24, see page 187; for 4.25 and 4.26, see page 189; and for 4.27 to 4.29, see page 190.

Question 4.27

4.27 Misleading résumés.

For more than two decades, Jude Werra, president of an executive recruiting firm, has tracked executive résumés to determine the rate of misrepresenting education credentials and/or employment information. On a biannual basis, Werra reports a now nationally recognized statistic known as the “Liars Index.” In 2013, Werra reported that 18.4% of executive job applicants lied on their résumés.7

  1. Suppose five résumés are randomly selected from an executive job applicant pool. What is the probability that all of the résumés are truthful?
  2. What is the probability that at least one of five randomly selected résumés has a misrepresentation?

4.27

(a) 0.3618. (b) 0.6382.