Use the summation formulas to rewrite the expression without the summation notation
$$ \sum_{i=1}^{n} \frac{8i + 7}{n^2} $$
$$ S(n) = $$
Use the result to find the sums for $$ n = 10, 100, 1000, $$ and $$ 10,000. $$
$$ n = 10 $$
$$ n = 100 $$
$$ n = 1,000 $$
$$ n = 10,000 $$