Use the following steps to present this data in a frequency distribution table. 1  Divide the results (x) into intervals, and then count the number of results in each interval. In this case, the intervals would be the number of households with no car (0), one car (1), two cars (2) and so forth.
1. Interactive Python (ipython) is simply amazing, especially as you are piecing things together on the fly... and does it in such a way that it is easy to go back. However, what seems to be interesting is the use-case of having multiple ipython notebooks (ipynb files). It apparently seems like a notebook is NOT supposed to have a relationship with other notebooks, which makes sense, except that I would love to import other ipynb files.
PTB is an acronym for Power Tab File. Files that contain the .ptb file extension most commonly store music tablatures that are used in the creation of sheet music for stringed instruments such as the bass and guitar. Many of the tablature files that contain the .ptb file suffix are created with the Power Tab Editor tablature authoring software. The Peachtree Corporate Accounting software is also known to use the .ptb file suffix. When a PTB file is associated with the Peachtree software, the file contains backup data files that are used by the application to restore lost or corrupt data.