Yes, I changed it to general for the example.
The number of frames is 12. The first 11 is breathing, 12 is blinking.
7 out of 20 is about one in three blinking possibilities. But the problem is that there is no random. The character either blinks or not, until a random animation interrupts the standing.
More details about the last. When I start the scene, the character stands and does not blink at all. If you wait for a random animation or walk around, then the character starts blinking constantly and does not stop even after subsequent interactions.