10 A machine is supposed to produce ball bearings with a mean diameter of 2.0 mm. A sample of eight ball bearings was taken from the production line and the diameters measured. The results, in...

Extracted text: 10 A machine is supposed to produce ball bearings with a mean diameter of 2.0 mm. A sample of eight ball bearings was taken from the production line and the diameters measured. The results, in millimetres, were as follows: 2.0 2.1 2.0 1.8 2.4 2.3 1.9 2.1 (i) Calculate the mean and standard deviation of the diameters. (ii) Do you think the machine is correctly set?