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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Apr 2008 17:45:04 IST
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Q . A student appear for test 1, 11 and 111. The student is successtlil if he passes either in test I and II or tests I & III. The probabilities of the student passing I, II, Ill are p. q and 1/2 respectively. If the probabilities that the student is successful is 1/2 then.
(A) p=1, q=0 (B) p=2/3, q=1/2
(C) p= 3/5, q= 2/3 (D) there are infinitely many values of p & q
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5 Apr 2008 17:51:56 IST
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p(1-q)1/2+pq1/2=1/2 solving we get p=1 and any value of q .only option a ) is correct.
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(d) P(sucess) = pq +p (1/2) => 1/2 = pq+p/2 => p(2q+1)=1 => p= 1/(2q+1) for different values of q we get different values of p... hence the answer is d rate if satisfactory...... Cheers!!  |
Here I am this is ME!!...and there's no where else on earth I'd rather be!!!!!! |
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5 Apr 2008 18:01:53 IST
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answer is D but how
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5 Apr 2008 18:06:11 IST
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see edited
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Here I am this is ME!!...and there's no where else on earth I'd rather be!!!!!! |
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5 Apr 2008 18:13:55 IST
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hey ashish does the answer solve your query???
tell me if i'm wrong...
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Here I am this is ME!!...and there's no where else on earth I'd rather be!!!!!! |
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