USAAAO — 2017 First Round

Edwin Hubble published in 1929 the paper “A Relation Between Distance and Extragalactic Nebulae” explaining his find that there exists a linear relationship between the radial velocities and distances for extragalactic objects. In the following graph you can see his data used in the paper. The units for the velocity are in km/s. (notice the “/ s” is missing from his original graph). What is the value for the Hubble constant that he derived from this data? Use the linear fit to the data marked with the continuous line to derive your estimation.