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Command mode, and input mode. You switch between them using the ESC key.The two modes of 'vi' are input mode, and command mode. In input mode all you can do is insert text, and in command mode you can make editing changes to existing text (by issuing commands).Switching between the modes is accomplished by pressing the ESC (escape) key.
No
The mean will increase substantially. The median may increase slightly or substantially - depending on how many observations are in the central values of the distribution. The mode should not change at all.
Prior to the introduction of 170, the mean, median, mode and range did not exist since there were no numbers at all. Once 170 is introduced, it becomes the mean, median and mode. The range is zero.
80