Question: An article in Microelectronics Reliability [Advanced Electronic Prognostics through System Telemetry and Pattern Recognition Methods (2007, Vol.47(12), pp. 18651873)] presented an example of electronic prognosis.

An article in Microelectronics Reliability [Advanced Electronic Prognostics through System Telemetry and Pattern Recognition Methods (2007, Vol.47(12), pp. 18651873)] presented an example of electronic prognosis. The objective was to detect faults to decrease the system downtime and the number of unplanned repairs in high-reliability systems. Previous measurements of the power supply indicated that the signal is normally distributed with a mean of 1.5 V and a standard deviation of 0.02 V. (a) Suppose that lower and upper limits of the predetermined specifications are 1.45 V and 1.55 V, respectively. What is the probability that a signal is within these specifications? (b) What is the signal value that is exceeded with 95% probability? (c) What is the probability that a signal value exceeds the mean by two or more standard deviations?

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