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The first 13 odd numbers are 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25.
Average = $$\frac{sum\ of\ data}{number\ of\ data}$$
= $$\frac{1+3+5+7+9+11+13+15+17+19+21+23+25}{13}$$
= $$\frac{169}{13}$$
= 13
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