I agree with the skewness of the data. Since it's skewed to right, I suggest to lower interval from 500 to maybe 200. I think that will tell a different story. The data might follow a normal distribution curve and averages can represent the data.
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Reporting both means and medians is ideal. If they're equal, you know the distribution is symmetric. If they're not, then you know skewness exists, which usually warrants a deeper dive to discover the underlying reasons, as you have suggested.
If you can only report one or the other, then report medians.