cumulative frequency formula

[Wheatmaster]

wtf is it? i've been lookin in my book for like 30 min and only graphs on the web.

 

[ResidentIdiot]

There is no formula. You just plot the sum's of the values Ie if you have values: 1 , 2 , 3 , 4 , 5 You would plot 1, 3, 6, 10, 15.