(5+12+13)/3 = 10 is the average
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The average mean is: (11+12+13+14+15)/5 = 13
A right-angled triangle. Per Pythagoras: (5*5) + (12*12) = 13*13
6/13 - 4/12 =5/396/13 * 12/12 = 72/1564/12 * 13/13 = 52/156==============....................20/156 or 5/39
13+-12--5 = 6
The average of 12 and 13 = (12 + 3)/2 = 15/2 = 7.5