Do you know how many times you use “Probably” in a day? The word refers to the possibility of a certain event happening. Irrespective of our ability to calculate the probability, we frequently estimate, compare and make decisions based on probability. It is a subjective degree of belief in the occurrence of an event. The concept of probability has philosophical, psychological and scientific interpretations. Putting simply, the probability of an event is the ratio between the number of favorable events and the number of all equally possible cases.