Rick Wing, salesperscn for Wave Soldering Systems, Inc: (WSS), has provided you with a peoposal for improving the lemperature coetrol on your presunt machine. The machine uses a hot-air integrated cicults have resiabities of 0.81,0.83,0.85 and 0.87 . The four backup ciculs alt have a reliabilify of 0.81 a) The overali ruliablity of the new lemperature controtion *