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# Kaplan Problem Susan flipped a fair coin N times. what

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Joined: 23 Jun 2005
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Kaplan Problem Susan flipped a fair coin N times. what [#permalink]

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11 Jul 2006, 09:45
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Kaplan Problem

Susan flipped a fair coin N times. what fraction of the flips came up heads?

1) N = 24

2) The number of flips that came up tails was 3/8(N)

the answer from Kaplan is "B" (I picked C). Their rationale is: statement 2 tells us the number of flips that came up tails as a fraction of N. The only other options is heads so we know the fraction of flips that came up heads. N is then irrelevant.

why is N irrelevant? Dont i need N to figure out the exact probablity here.

Kudos [?]: 8 [0], given: 0

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Joined: 25 Nov 2004
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11 Jul 2006, 09:59
minhthel wrote:
Kaplan Problem

Susan flipped a fair coin N times. what fraction of the flips came up heads?

1) N = 24
2) The number of flips that came up tails was 3/8(N)

the answer from Kaplan is "B" (I picked C). Their rationale is: statement 2 tells us the number of flips that came up tails as a fraction of N. The only other options is heads so we know the fraction of flips that came up heads. N is then irrelevant.

why is N irrelevant? Dont i need N to figure out the exact probablity here.

when the question asks for fractions, portions, percentage, we donot need absolute value. therefore, n is irrelavant. if the question were "how many times", it would be C and N would be relavant..

from B, the fraction is 1 - 3/8 = 5/8.

Kudos [?]: 123 [0], given: 0

Re: DS: what fraction of the flips came up heads?   [#permalink] 11 Jul 2006, 09:59
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