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# Danny, Doris and Dolly flipped a coin 5 times and each time

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Manager
Joined: 13 Jun 2005
Posts: 246
Location: Haverhill, MA
Danny, Doris and Dolly flipped a coin 5 times and each time  [#permalink]

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26 Jan 2006, 17:37
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Danny, Doris and Dolly flipped a coin 5 times and each time the coin landed on â€œheadsâ€

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Director
Joined: 20 Sep 2005
Posts: 998

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26 Jan 2006, 18:29
1/2 since the prior events are independent of what happens next.
Director
Joined: 09 Oct 2005
Posts: 683
Location: Madrid

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26 Jan 2006, 21:40
B it is))
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IE IMBA 2010

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 4804
Location: Singapore

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26 Jan 2006, 21:42
1
Flipping of coin is an independent event. The chance of landing on the tail on the 6th toss wil be 1/2
CEO
Joined: 20 Nov 2005
Posts: 2774
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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27 Jan 2006, 01:06
By logic this seems 1/2. But I am thinking something else (I don't know why).

Is it 1/4?? If correct, I will explain.
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Director
Joined: 17 Dec 2005
Posts: 532
Location: Germany

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27 Jan 2006, 03:04
The results are independent from each other, so the answer is 1/2.

However, if the coin landed five times on head, for which the prob is (1/2)^5, which is relatively little, it is possible that the coins isn't fair, resulting in a prob of 0
Manager
Joined: 13 Jun 2005
Posts: 246
Location: Haverhill, MA

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27 Jan 2006, 07:22
The OA is B.

and the OE is:
The probability of the coin is independent on its previous outcomes and therefore the probability for â€œheadâ€
SVP
Joined: 14 Dec 2004
Posts: 1594

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27 Jan 2006, 11:00
1/2.

This is good one
Non-Human User
Joined: 09 Sep 2013
Posts: 9420
Re: Danny, Doris and Dolly flipped a coin 5 times and each time  [#permalink]

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25 Jan 2018, 06:37
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Re: Danny, Doris and Dolly flipped a coin 5 times and each time &nbs [#permalink] 25 Jan 2018, 06:37
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# Danny, Doris and Dolly flipped a coin 5 times and each time

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