What is the origin of the idiom "nine times out of ten" and when to use it?

The idiom "nine times out of ten" derived from the numerical representation and the concept of probability. It likely emerged from common observations and experiences, where a particular outcome or event occurred with a high frequency or regularity. Over time, it became a widely used idiom in the English language to express a strong likelihood or probability. This phrase is used when discussing situations, outcomes, or patterns that are expected to occur or be true in the majority of cases.