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following gives you table of number of days it takes to

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Intern
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following gives you table of number of days it takes to [#permalink] New post 12 May 2008, 06:01
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following gives you table of number of days it takes to deliver the mail.

Days - number of mails
1 - 10
2 - 15
3 - 20
4 - x
5 - 30

whats the value of x so that average number of days it takes to deliver the mails is 3.
Thanks in advance.
Director
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Re: weighted average question [#permalink] New post 12 May 2008, 07:24
shmistry wrote:
following gives you table of number of days it takes to deliver the mail.

Days - number of mails
1 - 10
2 - 15
3 - 20
4 - x
5 - 30

whats the value of x so that average number of days it takes to deliver the mails is 3.
Thanks in advance.


Wow, who can understand and solve this?
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Re: weighted average question [#permalink] New post 12 May 2008, 09:20
something wrong with the question?
Director
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Re: weighted average question [#permalink] New post 12 May 2008, 09:31
I tried to look at it a couple different ways but the either way the missing number would have to be negative for the average to be 3. So I'm not sure what it's asking.
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Re: weighted average question [#permalink] New post 12 May 2008, 09:40
I am not sure about the numbers here. You can use bigger numbers and tell me the approach.
Thanks
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Re: weighted average question [#permalink] New post 12 May 2008, 16:17
shmistry wrote:
I am not sure about the numbers here. You can use bigger numbers and tell me the approach.
Thanks


Are you missing some probability weighting?
e.g. 20% receive 10 letters, 10% receive 15 letters, etc.
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Re: weighted average question [#permalink] New post 12 May 2008, 18:49
no..it wasnt percentage.. i am 99% sure this is what i saw .

Last edited by shmistry on 12 May 2008, 19:38, edited 1 time in total.
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Re: weighted average question [#permalink] New post 12 May 2008, 19:03
I would advise you not to make that admission
Re: weighted average question   [#permalink] 12 May 2008, 19:03
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following gives you table of number of days it takes to

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