what does todays rank mean

it says out of all the 23,966 players on chess.com members list u are ranked 3364 or in the 86% area which is good means for u above average which would be 50% or 1300+ got it ?......

Rating
Current: | 1184 |
Highest: | 1439 (25 Jun 2008) |
Avg. Opp.: | 1198 |
Best Win: | 1290 (lamfdtk) |
Today's Rank: | N/A |
in my friends rating its written na.what does n/a mean
i am d youngest member
i am a member in the minor master online group
for joining d group clic d link
http://www.chess.com/chessgroups?keyword=minor+masters



I am curious as to how often is the "Today's rank" recalculated.
Before winning my last game my rating was 1627 and rank was 9801.
After winning this game, my rating is now 1701 and rank is still 9801.
Also, a guy with rating 1677 has a rank of 8064, while I have a rating of 1701 and rank 9801 at this point in time.
That would be because it is updated daily, your rank will be changed when you log on tomorrow.

Maths people, please help me understand how percentile is calculated. My understanding of percentile is 'the percentage of people (or things) one is better than'. For example:
There is a class of 100 students. A test is given where maximum marks are 100. If one student gets 1 mark, another gets 2 marks, third gets 3 marks....100th student gets 100 marks.
Is the percentile of student getting 1 mark 0 ?
Is the percentile of student getting 2 marks 1 ?
Is the percentile of student getting 100 marks 99 ?
Does it mean by definition 100 percentile is simply not possible?

Skand - No. We'd say the first student is "in the 1st percentile". Likewise, the second student is "in the 2nd percentile". This works all the way up to the top, where we say that the last student is "in the 100th percentile".
Hope that helps.

There is more to it than meets the eye
http://www.haiweb.org/medicineprices/manual/quartiles_iTSS.pdf
It seems related to probability too not just straight percentage.
After going through some of the heavy stuff in this link, I get a feeling that in my example the student getting 100% marks will have neither 99 nor 100 as percentile.
Essentially I was trying to figure out what the % in today's rating/ranking stands for. Haven't got exact meaning yet - the basic meaning is obvious - that you are in top (100-P)% of the players among chess.com's online players.
what is todays rank mean in d main page