In four coin tosses, the probability of getting tails would be 0.59. Probability can be considered as the measurement of the chances of an event to occur. This event could be as small as a rolling dice or a coin toss, and as large as a natural disaster.
Probability is hence used in a variety of different subjects, wherever there is a need to measure the chances of an event to happen for instance, economics, physics, and biology. The applications of probability are vast and spread out to nearly every branch of study that there is, and it is used in many different theoretical frameworks.