95 percetile

hello

i have som custom graphs, (created with sensor factory). for instance

#1:peer-b1
Channel(2474,-1)
#2:peer-dc
Channel(2475,-1)
#3:nx-ines
Channel(2477,-1)
#4:All
(Channel(2474,-1)+Channel(2475,-1)+Channel(2477,-1))

the channel sub-id (-1) is the Traffic Total channel, for every above graph. all si fine, the graph has all the info i wanted. i would like to add another channel, with the 95 % line, but i could't figure it out how to do it. i guess, i have to use the max(channel,channel) and then *95/100 ? tried some different calculations, but could not do it.

is this possible? the ideea is that if i can get a 95%line with a value associated with it, i can also trigger an alarm, which is what i want to do. thanks.