relative frequency
https://www.aplustopper.com/cumulative-frequency-statistics/
https://sites.google.com/site/aplustoppernotes/relative-frequency
http://cbsetuts.blogspot.in/2018/01/relative-frequency.html
What is Cumulative Frequency in statistics
If the frequency of first class interval is added to the frequency of second class and this sum is added to third class and so on then frequencies so obtained are known as Cumulative Frequency (c.f.).
There are two types of cumulative frequencies (a) less than, (b) greater than
A table which displays the manner in which cumulative frequencies are distributed over various classes is called a cumulative frequency distribution or cumulative frequency table.
There are two types of cumulative frequency.
(1) Less than type
(2) Greater than type
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