Solution
The first 14 positive even numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28.
Required average = $$\frac{first\ term+last\ term}{2}$$
= $$\frac{2+28}{2}$$
= $$\frac{30}{2}$$
= 15
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