Solution
all the even numbers between 11 and 27 are 12, 14, 16, 18, 20, 22, 24, 26.
Average of all the even numbers between 11 and 27 = $$\frac{sum\ of\ data}{number\ of\ data}$$
= $$\frac{12+14+16+18+20+22+24+26}{8}$$
= $$\frac{152}{8}$$
= 19
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