sir, i want to know that how do we find a cumilative frequency? and also is there any easy way to larn all the formulas since it gets very complicated to learn them??

Cumulative frequency of a particular class is just the summation of frequencies from previous classes and the class frequency. Practise the formulae with examples a lot number of times, so that the fomulae comes handy.

Regards,

Team,

TopperLearning.