CBSE Class 9 Maths Notes Chapter 15: You may get the Class 9 Maths Revision Notes, Chapter 15 Probability, in PDF format from here. Simply put, probability is an uncertain event. It is a means of calculating the degree of uncertainty in any given circumstance. Empirical probability, which is derived from actual experiments, is the outcome of probability based on actual experiments and is regarded as an experimental technique in mathematics.
The quantity of trials and the frequency with which the desired event occurs determine probability. Get the free Class 9 revision notes Maths Ch 15 from here to gain a deeper comprehension of the ideas.CBSE Class 9 Maths Notes Chapter 15 PDF
If there is only one possible outcome of an event to take place, then it is what we call an Elementary Event. For example, if we add all the elementary events of an experiment then their sum will be 1.
The general form is as given:
P (H) + P (T) = 1
P (H) + P= 1 (where H- ‘not H’).
P (H) – 1 = P
P (H) and P are called complementary events.