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... *NM* Sareitha Sedai Send a noteboard - 02/04/2014 02:30:34 PM

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let's exaggerate the problem:

Month 1: 1 person, 0 redhead (0%)
Month 2: 99 people, 99 redhead (100%)

method 1:
(0% + 100%)/2 = 50%

method 2:
(0+99)1+99) = 99%

the first method gives an equal weighting to each month, regardless of the number of people in it's measurement.
the second number gives equal weighting to each person, regardless of the month he was observed in.

now, as Tom said, it really depends on what exactly is the question you are trying to answer.


If you are from Betelgeuse, please have one of your Earth friends read what I've written before you respond. Or try concentrating harder.

"The trophy problem has become extreme."
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A math question - 01/04/2014 06:13:11 PM 864 Views
Word problems suck for us overthinkers - 01/04/2014 07:01:06 PM 538 Views
If this question is from an exam, it is truly vile. - 08/04/2014 07:14:48 AM 701 Views
You are computing two separate things. That is the problem. - 01/04/2014 07:04:49 PM 543 Views
it's a matter of different geometric weighting - 02/04/2014 09:51:37 AM 533 Views
... *NM* - 02/04/2014 02:30:34 PM 245 Views
Hmm. - 02/04/2014 09:16:02 PM 554 Views
- 03/04/2014 08:26:20 AM 615 Views
Think about the your underlying question - 08/04/2014 07:11:24 AM 723 Views

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