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In an experiment to measure the length, in centimetres, of an exercise book, 16 students recorded the following:
12.8 12.5 13.4 13.6 13.5 14.5 15.2 11.8
14.5 13.9 13.7 14.4 14.4 14.3 15.3 14.7
Construct a frequency table and use it to determine the mean and the mode.