A piece of electronic equipment used for aviation has three elements connected in series, or sequence. The

Question:

A piece of electronic equipment used for aviation has three elements connected in series, or sequence. The reliability of each of the three elements is as follows: Element A: 0.92 Element B: 0.94 Element C: 0.91
a) Draw how these three elements are connected.
b) What is the reliability of this system?
c) Suppose we wanted the reliability to be at least 0.85 by upgrading Element C with a higher quality. What would the reliability of Element C need to be?
d) Instead of increasing the reliability of Element C, each of the elements is supported by an identical element in parallel as a back-up. What is the reliability of this system?