Probability
Likelihood, Chances
noun
You're certain there is this percent chance it will happen? You know that this is the probability?
かくりつ
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.
コウイチがあやまってこの穴に落ちる確率は、20%ぐらいだろうね。
The probability of Koichi accidentally falling into this pit is at about 20%.
コウイチが友情に厚い人である確率はどのぐらいだと思いますか？
What's the likelihood of Koichi being someone who's kind to his friends?
ビエトはコウイチに、Tofuguが成功する確率は二百パーセントだと言いきった。
Viet told Koichi that the chances of Tofugu succeeding were 200%.