A manufacturing process produces a critical part of average length 80 ​millimeters, with a standard deviation of 3 millimeters. All parts deviating by more than 5 millimeters from the mean must be rejected. What percentage of the parts must be​ rejected, on​ average? Assume a normal distribution.

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A: According to our guidelines, we can answer only three subparts. So please repost the rest subparts.

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