Question: Continuation of Exercise 4 20 Reconsider the power supply manufacturing process

Continuation of Exercise 4.20. Reconsider the power supply manufacturing process in Exercise 4.20. Suppose we wanted to improve the process. Can shifting the mean reduce the number of nonconforming units produced? How much would the process variability need to be reduced in order to have all but one out of 1,000 units conform to the specifications?
In exercise The output voltage of a power supply is normally distributed with mean 5 V and standard deviation 0.02 V. If the lower and upper specifications for voltage are 4.95 V and 5.05 V, respectively, what is the probability that a power supply selected at random will conform to the specifications on voltage?

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