This is a Excellent Application on Learning Probability, Includes Video Training and Practice Exam.
Probability or likelihood is a measure or estimation of how likely it is that something will happen or that a statement is true. Probabilities are given a value between 0 0% chance or will not happen and 1 100% chance or will happen. The higher the degree of probability, the more likely the event is to happen, or, in a longer series of samples, the greater the number of times such event is expected to happen.