The mean of the data 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 is

Mean $= \frac{sum of observations}{number of observations}$

Mean of the data 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 is

$= \frac{16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26}{11}$

$= \frac{231}{11}$

$= 21$

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