Answer :
The minimum acceptable rate of 1 sigma of quality production is d) 68.
This corresponds to a 68% acceptance level, which is equivalent to 1 standard deviation in a normal distribution.
A 1 sigma level corresponds to a standard deviation that captures approximately 68% of the data within a normal distribution. This means that if a process is operating at a 1 sigma level, it has a 68% acceptance rate, and the remaining 32% of the data falls outside the acceptable range
Learn more about acceptance level here: brainly.com/question/14144046
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