The fifteenth chapter in Mathematics textbook is 'Probability'.
- Theoretical probability associated with an event E is defined as “If there are ‘n’ elementary events associated with a random experiment and m of these are favourable to the event E then the probability of occurrence of an event is defined by P(E) as the ratio mn “.
- If P(E) = 1, then it is called a ‘Certain Event’.
- If P(E) = 0, then it is called an ‘Impossible Event’.
- The probability of an event E is a number P(E) such that: 0 ≤ P(E) ≤ 1
- An event having only one outcome is called an elementary event. The sum of the probabilities of all the elementary events of an experiment is 1.
- For any event E, P(E) + P(E¯) = 1, where E¯ stands for ‘not E’.
E and E¯ are called complementary events.
- Favourable outcomes are those outcomes in the sample space that are favourable to the occurrence of an event.
The topics discussed in this chapter are as follows:
- What is Probability?
- Experimental Probability
- Theoretical Probability
- Elementary Event
- Sum of events
- Impossible and sure event
- Geometric Probability
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NCERT Solutions for Chapter 15: Probability
Also Check
Chapter 1: Real Numbers
Chapter 2: Polynomials
Chapter 3: Pair of Linear Equations in Two Variables
Chapter 4: Quadratic Equations
Chapter 5: Arithmetic Progression
Chapter 6: Triangles
Chapter 7: Coordinate Geometry
Chapter 8: Introduction to Trigonometry
Chapter 9: Some Applications of Trigonometry
Chapter 10: Circle
Chapter 11: Constructions
Chapter 12: Areas Related to Circles
Chapter 13: Surface Areas and Volume
Chapter 14: Statistics
Check out Frequently Asked Questions (FAQs) for Chapter 15: Probability
The probability that a number selected at random from the numbers 1, 2, 3, 4, …, 15 is a multiple of 4 is
1/5
If P(A) denotes the probability of an event then
0 ≤ P(A) ≤ 1
When a die is thrown, the probability of getting an odd number less than 3 is
1/6
Someone is asked to take a number from 1 to 100. The probability that it is a prime is
1/4
An event is very unlikely to happen. Its probability is closest to
0.0001
