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Ex 13.2, 3 - Chapter 13 Class 12 Probability
Last updated at July 26, 2026 by Teachoo
Chapter 13 Class 12 Probability
Concept wise
- Conditional Probability - Values given
- Conditional Probability - Statement
- Multiplication rule of probability
- Independent events
-
Basic Probability
- Theorem of total probability
- Bayes theorem
- Random Variable - Defination
- Probability distribution
- Mean or Expectation of random variable
- Variance and Standard Deviation of a Random Variable
- Bernoulli Trials
- Binomial Distribution
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Transcript
Ex 13.2, 3 A box of oranges is inspected by examining three randomly selected oranges drawn without replacement. If all the three oranges are good, the box is approved for sale, otherwise, it is rejected. Find the Probability that a box containing 15 oranges out of which 12 are good and 3 are bad ones will be approved for sale.Given Total Number of oranges = 15 Number of Good oranges = 12 Number of Bad oranges = 3 Given that Box is approved for sale if all 3 oranges are good Now, Probability that box is approved for sale = Probability that first orange is good × Probability that second orange is good, given first is good × Probability that third orange is good, given first two are good = 12/15 × 𝟏𝟏/𝟏𝟒 × 𝟏𝟎/𝟏𝟑 = 44/91
