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Senior Manager
Joined: 08 Jun 2004
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02 Jul 2006, 07:50
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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Prob_Leo.doc [64.5 KiB]

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Manager
Joined: 27 Jan 2006
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Location: Europe

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02 Jul 2006, 08:15
d) 0.657 ?

the probability that A plays song that Leo does't like = 7/10
the probability that B plays song that Leo does't like = 7/10
the probability that C plays song that Leo does't like = 7/10

0.7^3 = 0.343

1-0.343 = 0.657
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Stay hungry, Stay foolish

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VP
Joined: 21 Sep 2003
Posts: 1057

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Location: USA

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02 Jul 2006, 09:57
Agree it should be D.

P(Listening to a song) = 1 - P(Not listening to song on A or B or C) = 1- {7/10*7/10*7/10} = 657/1000
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

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Director
Joined: 06 May 2006
Posts: 790

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02 Jul 2006, 11:17
Yep. Looks like D. as per explanations abov.
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Uh uh. I know what you're thinking. "Is the answer A, B, C, D or E?" Well to tell you the truth in all this excitement I kinda lost track myself. But you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?

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Senior Manager
Joined: 08 Jun 2004
Posts: 494

Kudos [?]: 95 [0], given: 0

Location: Europe

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03 Jul 2006, 23:06
Yes guys OA is D 0.657.

Thank you for explanations.

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SVP
Joined: 30 Mar 2006
Posts: 1728

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03 Jul 2006, 23:21
another approach

Probability that A plays the right music = 0.3
Probability that B plays the right music = 0.7*0.3 = .21
Probabiltiy that C plays the right music = 0.7*0.7*0.3 = .147

Total = 0.657

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CEO
Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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04 Jul 2006, 00:15
jaynayak wrote:
another approach

Probability that A plays the right music = 0.3
Probability that B plays the right music = 0.7*0.3 = .21
Probabiltiy that C plays the right music = 0.7*0.7*0.3 = .147

Total = 0.657

This is exaxtly the approach I used.
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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04 Jul 2006, 00:15
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