To rank the data sets in order of standard deviation from smallest to largest, I would need to evaluate the spread of the data in each histogram. Since you mentioned that the scales on the horizontal axis are the same, the histogram with the most concentrated data (where the data points are closest together) will have the smallest standard deviation, and the one with the data spread out the most will have the largest standard deviation.

To proceed with this:

1. Upload the images of the histograms, or describe them if visual assessment is sufficient.
2. I will analyze them and provide the correct ranking.

Would you like to upload the histograms or describe them in detail?