Tolerance is a term that defines the range of values above and below the labeled value that an actual component may have. For example, a resistor labeled 220 Ω with a tolerance of 10% may have an actual value of 220+10% (242 Ω) to 220 -10% (198 Ω). As you can see in the tables, not all tolerances are expressed as percentages. I once asked whether tolerance was related to any statistical sampling, e.g., whether it represented some number of standard deviations or such. The answer I got was "no." It is a qualification and every piece must be within the tolerance to be released. You will also find that a package of 5% resistors from the same lot will probably be much closer than 5% to each other.
I looked at the table and cannot find a "k" tolerance where you indicate. What that table shows is that when there is no label, the default tolerance is 10%.
John
Edit: I stand corrected. I had assumed its absence in the table was a default. Apparently, it should read "k." The tolerance should also read ±10%, not ±I0%. So, I assume both are typos.