Code:
\[ \sum_{i=1}^{n}\frac{f(x_{i})}{n}\geq f(\frac{\sum_{i=1}^{n}x_{i}}{n}) \]
Code:
\[ \sum_{i=1}^{n}\frac{f(x_{i})}{n}\geq f(\frac{\sum_{i=1}^{n}x_{i}}{n}) \]
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