The probability of Koichi accidentally falling into this pit is at about 20%.
What's the likelihood of Koichi being someone who's kind to his friends?
Viet told Koichi that the chances of Tofugu succeeding were 200%.
You're certain there is this percent chance it will happen? You know that this is the probability?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.