8 A plumber measures, to the nearest cm, the lengths of pipes. a Suggest a suitable model to represent the difference between the true lengths and the measured lengths. b Find the probability that, for a randomly chosen pipe, the measured length will be within 0.2 cm of the true length. e Three pipes are selected at random. Find the probability that the measured lengths of all three pipes will be within 0.2 cm of the true length. (1 mark) (2 marks) (2 marks)