Homework set 3 data file corrections

[jstac]

A few people have pointed out that the data file company_list.csv that I supplied contains lots errors and dubious numbers. @cc7768 has supplied a new one called company_list_corrected.csv that seems to be in much better shape.

In your homework please use the corrected version if you haven't written your code yet. If you've already written / submitted your homework using the first one then there's no need to change. (In terms of learning Python the exercise is more or less the same.)

Finally, note that any entries with missing data can be dropped.