How does cacti calculates AVG?

Andre Luis <[email protected]>
Newsgroups gmane.network.cacti.user
Message-ID <CAGUytZ1nR8_bmnrk0Kn1rTN-CqjaDr65f3X-+pyCddocywn13A@mail.gmail.com>
I am monitoring the number of sessions on a database.
now I am seeing On the graph on the period of 2012-03-14 00:00 to
2012-03-15:00 ... and the avg on the graph is 200 sessions on this period...
but if I sum all the data stored on the rrd on the same period (using
rrdtool fetch), then divide by number of the datas, then I got something
about 100 sessions..

anyone knows why is this happening?
so, how does cacti calculates the AVG?

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