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At a two-day seminar, 90% of those registered attended the

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Senior Manager
Joined: 12 Mar 2007
Posts: 276
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At a two-day seminar, 90% of those registered attended the [#permalink]  12 Jul 2007, 11:53
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At a two-day seminar, 90% of those registered attended the seminar on the first day. What percent of those registered did not attend the seminar on either day?

1) A total of 1000 people registered for the two-day seminar.
2) Of those registered, 80% attended the seminar on the second day.

I'm lost on this one. I think Venn Diagram should be used here, but I have no idea how to apply it. Please help. Thanks!
Manager
Joined: 08 Jul 2007
Posts: 174
Followers: 1

Kudos [?]: 1 [0], given: 0

I am getting E on this one.

1) INSUFFICIENT: This tells us that 900 people attended the seminar on the first day. 100 people did not atttend. But we know nothing about day 2.

2) INSUFFICIENT: We don't have any numbers to calculate how many people actually went to the seminar on both days.

Together: We know that 100 people did not attend on day 1 and that 200 people did not attend on day 2. But these could be unique people, so that 0% did not attend the seminars on either day. It could also be that the 100 people who did not attend on day 1 did not attend on day 2. So together insufficient.

A venn diagram would only be useful if we knew something about the overlap, ie how many people who went to the seminar on day 1 that also went on day 2. Since we have nothing on that, I am thinking E.
Director
Joined: 08 Feb 2007
Posts: 610
Location: New Haven, CT
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I would say E, because you don't know how much overlap there is between the first and second days.
Director
Joined: 26 Feb 2006
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Re: DS - seminar attendants [#permalink]  12 Jul 2007, 12:22
leeye84 wrote:
At a two-day seminar, 90% of those registered attended the seminar on the first day. What percent of those registered did not attend the seminar on either day?

1) A total of 1000 people registered for the two-day seminar.
2) Of those registered, 80% attended the seminar on the second day.

I'm lost on this one. I think Venn Diagram should be used here, but I have no idea how to apply it. Please help. Thanks!

E. We do not know who registered on the first day and who did for the second day. there could be possibility that those registered for the first day did also register for the second day as well. it is also possible that those did not register for the first day also did not register for the second day.

i donot know how to draw a ven diagram on the computer. but if you can, it would clearly help.
Senior Manager
Joined: 12 Mar 2007
Posts: 276
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Kudos [?]: 16 [0], given: 2

Thanks for all the help. The OA is E.
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