1. A quality assurance test is carried out on the diameter of bearings being produced at a local manufacturing company as the company is finding an unacceptable number being returned as faulty. Fifteen bearings were taken and measured and the results shown below, given that a natural variation is permitted you must analyse the data and determine: a) The mean diameter. b) The variance of the sample. c) The standard deviation of the sample. 6.18 6.84 8.29 5.50 7.15 5.45 8.08 7.16 7.22 5.31 7.83 7.74 6.96 5.44 4.46 Diameter of Bearings