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CBSE Class 12-science Answered

State Bayes’ theorem. 
Asked by Topperlearning User | 19 Aug, 2016, 11:00: PM
answered-by-expert Expert Answer

Bayes’ theorem - Statement: If E1, E2,..., En are n non-empty events which constitute a partition of sample space S, i.e. E1, E2, ..., En are pair-wise disjoint such that a n d space E subscript i intersection E subscript j equals empty set space f o r space i not equal to j space i comma j equals 1 comma 2 comma.... comma n

and ‘A’ is any event of nonzero probability, then

 for any i = 1, 2, 3,… n
Answered by | 20 Aug, 2016, 01:00: AM

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CBSE 12-science - Maths
bag 1 contains 8 red and 2 black balls. bag 2 contains 7 red and 5 Black balls. one of the bags is chosen at random and a ball is drawn from it, which is found to be black. find the probability that the ball is drawn from bag 1.
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CBSE 12-science - Maths
Two urns contains 1 white,6 red and 4 white,3 red balls. One of t 3 he urn is selected at random and a ball is drawn from it. Find: (1) The probability of drawing a red ball. (ii) The probability of drawing the ball from the first urn if b all drawn is red.
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CBSE 12-science - Maths
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Asked by jain.pradeep | 05 Dec, 2019, 12:26: AM
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CBSE 12-science - Maths
State Bayes’ theorem. 
Asked by Topperlearning User | 19 Aug, 2016, 11:00: PM
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CBSE 12-science - Maths
Define posteriori probability
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
A doctor is to visit a patient. From the past experience, it is known that the probabilities that he will come by train, bus, and scooter or by other means of transport are respectively 0.3, 0.2, 0.1 and 0.4. The probabilities that he will be late are, if he comes by train, bus and scooter respectively, but if he comes by other means of transport, then he will not be late. When he arrives, he is late. What is the probability that he comes by scooter? What is your opinion about being 'late'? Which life skills a person lacks by being 'late'?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
A manufacturer has three machine operators A, B and C. The first operator A produces 1% defective items, where as the other two operators B and C produce 5% and 7% defective items respectively. A is on the job for 50% of the time, B is on the job for 30% of the time and C is on the job for 20% of the time. A defective item is produced, what is the probability that it was produced by B? A manufacturer knows that the item is defective; even then he sells it in the market. Is he doing the right thing? Which life skill is he lacking?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
In answering a question on a multiple choice test, a student either knows the answer or guesses. Let 3/4 be the probability that he knows the answer and 1/4 be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability 1/4 . What is the probability that the student knows the answer given that he answered it correctly?
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CBSE 12-science - Maths
 An urn contains five balls. Two balls are drawn and found to be white. Find the probability that all the balls are white.  
Asked by Topperlearning User | 19 Aug, 2016, 11:37: PM
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CBSE 12-science - Maths
Define random variable.  
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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