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# A local restaurant draws a business card from a jar every

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Intern
Joined: 18 Jun 2011
Posts: 49
A local restaurant draws a business card from a jar every  [#permalink]

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19 Jun 2011, 08:05
1
00:00

Difficulty:

55% (hard)

Question Stats:

50% (01:26) correct 50% (01:17) wrong based on 130 sessions

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A local restaurant draws a business card from a jar every day. The person whose name is drawn receives a free meal. Floyd drops his business card in the jar at the beginning of the month. Thirty days later, assuming that his card hasn't been drawn yet, what is the percent change in the probability that Floyd's card will be drawn from the jar on the next drawing?

(1) Only one card is drawn from the jar every day.

(2) On average, 10 business cards are added to the jar everyday.
Current Student
Joined: 26 May 2005
Posts: 457

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19 Jun 2011, 09:35
guygmat wrote:
A local restaurant draws a business card from a jar every day. The person whose name is drawn receives a free meal. Floyd drops his business card in the jar at the beginning of the month. Thirty days later, assuming that his card hasn't been drawn yet, what is the percent change in the probability that Floyd's card will be drawn from the jar on the next drawing?

(1) Only one card is drawn from the jar every day.

(2) On average, 10 business cards are added to the jar everyday.

None of the options give you the number of cards in the jar. Hence insufficient
Intern
Joined: 10 Jun 2011
Posts: 1

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20 Jun 2011, 20:25
hmm I thought we could just assume that initialy the box was emplty and then kept increasing 10 cards a day.
Director
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 860

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23 Jun 2011, 04:12
a no idea about the initial number of cards and cards added per day.Not sufficient.

b no idea about how many cards drawn/day and initial number of cards.

a+b initial number of cards still now known.

E it is.
Manager
Joined: 06 Feb 2011
Posts: 51
WE: Information Technology (Computer Software)

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06 Sep 2011, 13:34
Initial number of card is not provided. Hence my choice is E.
Non-Human User
Joined: 09 Sep 2013
Posts: 13170
Re: A local restaurant draws a business card from a jar every  [#permalink]

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24 Jan 2018, 07:33
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Re: A local restaurant draws a business card from a jar every   [#permalink] 24 Jan 2018, 07:33
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