(a) (i) List FOUR sources of error that may be encountered when taking measurements in a physics laboratory. [4 marks] (ii) Distinguish between systematic error and random error, giving ONE example of each. [4 marks] (b) A student measures the diameter of a wire using a micrometer screw gauge and records the following values (in mm): 2.53, 2.55, 2.54, 2.56, 2.52. (i) Calculate the mean diameter of the wire. [2 marks] (ii) Calculate the mean absolute deviation of the measurements. [3 marks] (iii) Express the diameter of the wire in the form (mean ± mean absolute deviation) mm and state what this expression implies about the measurement. [3 marks]