Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 18 May 2013, 02:11

Probability of team's winning

Author Message
TAGS:
Senior Manager
Joined: 18 Aug 2009
Posts: 313
Followers: 2

Kudos [?]: 50 [0], given: 9

Probability of team's winning [#permalink]  01 Nov 2009, 04:16
00:00

Question Stats:

75% (01:49) correct 25% (02:04) wrong based on 3 sessions
Plz see the image (click + to expand and for a clearer resolution)...
Attachments

clubPlaceholder.JPG [ 20.55 KiB | Viewed 2161 times ]

Manager
Joined: 22 Jul 2008
Posts: 101
Location: Bangalore,Karnataka
Followers: 3

Kudos [?]: 25 [0], given: 11

Re: Probability of team's winning [#permalink]  01 Nov 2009, 04:25
must be 1/8 since there are three games left and each game's win probability is 1/2 for three games its 1/8 (A)
Senior Manager
Joined: 18 Aug 2009
Posts: 313
Followers: 2

Kudos [?]: 50 [0], given: 9

Re: Probability of team's winning [#permalink]  01 Nov 2009, 04:44
kirankp wrote:
must be 1/8 since there are three games left and each game's win probability is 1/2 for three games its 1/8 (A)

hmm.. the answer is correct, but the derivation is not
hint: think of the possible scenarios with the 3 games
Manager
Joined: 29 Oct 2009
Posts: 212
Followers: 49

Kudos [?]: 417 [0], given: 18

Re: Probability of team's winning [#permalink]  01 Nov 2009, 05:02
the only way the team can end with a winning record is if they win all 3 games.

winning 2 games or less can in no way make wins>losses (which is necessary for condition of winning record).

therefore the probability of ending with a winning record = probability of winning all 3 games = (1/2)*(1/2)*(1/2) = 1/8

Ans: A (1/8)
_________________

Click below to check out some great tips and tricks to help you deal with problems on Remainders!
compilation-of-tips-and-tricks-to-deal-with-remainders-86714.html#p651942

1) Translating the English to Math : word-problems-made-easy-87346.html

Senior Manager
Joined: 18 Aug 2009
Posts: 313
Followers: 2

Kudos [?]: 50 [0], given: 9

Re: Probability of team's winning [#permalink]  03 Nov 2009, 00:19
anyone else wants to give it a try before the OA?
Joined: 31 Dec 1969
Location: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
WE: Accounting (Accounting)
Followers: 0

Kudos [?]: 32 [0], given: 54126

Re: Probability of team's winning [#permalink]  03 Nov 2009, 07:37
IMO 1/8

As the team will win the series only by winnning three games(even if it wins 2 or 1 game it will lose)

What is the OA
Senior Manager
Joined: 18 Aug 2009
Posts: 313
Followers: 2

Kudos [?]: 50 [0], given: 9

Re: Probability of team's winning [#permalink]  07 Nov 2009, 08:53
Oops forgot to post the OA for this one: A

All of you got it right, and there are so many ways to reach a probability solution.. here is the official approach given:
Total possible outcomes: WWW, WWL, WLW, LWW, LWL, LLW, WLL, LLL. Total 8.
Favorable outcomes: WWW. Total 1.

Probablity=1/8
Manager
Joined: 27 Oct 2009
Posts: 155
Location: Montreal
Schools: Harvard, Yale, HEC
Followers: 1

Kudos [?]: 2 [0], given: 18

Re: Probability of team's winning [#permalink]  07 Nov 2009, 10:05
just want to comment on gmattokyo solution: you forget to add the fact that we need 3 wins to get the wining seasons. lets say if they have 12 L and 12 W and 3 to go, all they need is 2 W and the prob is 1/4.
Re: Probability of team's winning   [#permalink] 07 Nov 2009, 10:05
Similar topics Replies Last post
Similar
Topics:
If the probability that Mike can win a championship is 1/4, 12 26 Mar 2005, 20:43
2 The probability that Mike can win is 1/4, Rob winning is 14 18 Apr 2006, 12:58
1 If the probability that Mike can win a championship is 1/4, 5 01 Apr 2007, 18:01
If the probability that Mike can win a championship is 1/4, 8 17 Jul 2007, 15:32
John and Peter are among the nine players a basketball coach 12 31 Jul 2008, 16:56
Display posts from previous: Sort by