b. A company makes parts for a machine. The lengths of the parts must be within certain limits or they will be rejected. A large number of parts were measured and the mean and standard deviation were...

Extracted text: b. A company makes parts for a machine. The lengths of the parts must be within certain limits or they will be rejected. A large number of parts were measured and the mean and standard deviation were calculated as 3.1 and 0.005 m respectively. Assuming this data is normally distributed and 99.7 % were accepted, what are the limits ?