The times in minutes taken to run a marathon were recorded for a group of 13 marathon runners and were found to be as follows.

180, 275, 235, 242, 311, 194, 246, 229, 238, 768, 332, 227, 228

State which of the mean, mode or median is most suitable as a measure of central tendency for these times. Explain why the other measures are less suitable.