The two graphs, like a dot plot, have both an x- and y-axis. You can calculate the spread of the dots by subtracting the minimum value from the maximum value on the chart. The center of the ...

A dot plot is judged by its position along an axis; in this case, the horizontal or x axis. A bar chart is judged by the length of the bar. I don’t like using lengths with logarithmic scales.

There is disagreement on the proper way to label logarithmic scales in charts and graphs, especially when the base is not 10. This post shows several alternative ways of labeling log scales ...