(13 + 15 + 26 + 11 + 26 + 16 + 12)/7
= 17
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First put them in order:11, 12, 13, 15, 16, 26, 26.Then use your fingers the numbers at the opposite ends:11, 12, 13, 15, 16, 26, 26.Then keep moving in11, 12, 13, 15, 16, 26, 26.11, 12, 13, 15, 16, 26, 26.Until you come to the middle:11, 12, 13, 15, 16, 26, 26.So the median is 15.
12 + 23 + 14 + 11 = 60/4 = 15 The average is therefore 15.
11 15 16
Geometric mean of 12 and 15 is 13.416407864998738 Look at link: "Calculation of the geometric mean of two numbers".
It is 11.5