How would one express this in the form of an equation?
The average of 500 numbers, each of which are between 2 and 50, is 7.5
And can it be graphed?
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$\frac{1}{500} \sum_{k=1}^{500} x_k = 7.5$ and $x_k \in [2,50]$ for any $k \in [1..500]$.
The only reasonable way to display it graphically is to plot the points $(k,x_k)$ for each $k$, and draw two horizontal lines for the lower and upper bounds, and another horizontal line to denote the average. You can do this easily using any spreadsheet software.
user21820
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$$\sum_{2\leq n_i\leq50}_{i=1}^{i=500}\frac{n_i}{500}=7.5$$
– Vikram Jan 04 '15 at 09:54