The Manufacturing of Compact Disks Requires Four Steps

Multiple Choice

The manufacturing of compact disks requires four steps. The reliabilities of the steps are 0.80, 0.85, 0.95, and 0.90 respectively. What is the reliability of the process to produce a good compact disk?

A) less than or equal to 0.45
B) greater than 0.45 but less than or equal to 0.50
C) greater than 0.50 but less than or equal to 0.55
D) greater than 0.55