Probability is defined as the numerical method of measuring uncertainty involved in a situation. It is widely used in the study of mathematics, statistics, gambling, physical science, biological science, weather forecasting, finance etc. to conclude. Probability = the number of ways of achieving success. The total number of possible outcomes. For example, the probability of flipping a coin and it being heads is ½, because there is 1 way of getting a head and the total number of possible outcomes is 2 (a head or tail). We write P (heads) = ½. The probability formula is used to compute the probability of an event to occur. To recall the likelihood of an event happening is called probability.