Tips for Board examination preparation – Probability
This last chapter 13 has weightage of 10 marks. There will be one 6-mark question and one 4-mark question or two 4-mark questions with 1-mark question/s.
Your target time for first revision should be 7-8 hours appx for the six exercises (13.1 to 13.5) and the Misc exercise and also little bit of previous years’ questions from reference book.
Some important questions from NCERT are as follows:
| Ex 13.1 | example 7 | Question 5, 10, 12, 15, 17 |
| Ex 13.2 | examples 9, 11, 13, 14 | Questions 4, 6, 9, 13, 14, 16 |
| Ex 13.3 | examples 16, 18, 20, 21 | Questions 1, 3, 4, 5, 7, 10, 12, 13 (important exercise) |
| Ex 13.4 | examples 24, 25, 26, 29 | Questions 5, 9, 11, 13, 15, 17 |
| Ex 13.5 | Examples 30, 31 | Questions 4, 6, 8, 10, 13 |
| Misc 13 | examples 35, 36, 37 | Questions 2, 5, 6, 7, 9, 11, 13, 14, 16, 18 |
Tips:
- Conceptual clarity is very important in this chapter. .
- Be careful about cases of with replacement and without replacement.
- In Bayes’ Theorem, carefully identify E1, E2, E3…. and A and then P(E1), P(E2), ….., P(A/E1), P(A/E2) etc.
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