The arithmetic mean of a set of numbers is the sum of those numbers divided by their count. Thus the arithmetic mean of \( \{ 4, 5, 9 \} \) is

\[ \frac{4+5+9}{3} = \frac{18}{3} = 6. \]

The arithmetic mean of a set of numbers is the sum of those numbers divided by their count. Thus the arithmetic mean of \( \{ 4, 5, 9 \} \) is

\[ \frac{4+5+9}{3} = \frac{18}{3} = 6. \]

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