Solution
All the prime numbers less than 15 are 2, 3, 5, 7, 11, 13.
Approximate average of all the prime numbers less than 15 = $$\frac{sum\ of\ data}{number\ of\ data}$$
= $$\frac{2+3+5+7+11+13}{6}$$
= $$\frac{41}{6}$$
= 6.83
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