reality is fc Barcelona and it means football club Barcelona or cf club of football of Barcelona
CF= Cluster F*^k. When everything goes to complete crap.
It is 3 more than the cumulative frequency up to the previous class or value.
The cumulative frequency is the running total of numbers, such as,frequency cumulative frequency4 4 5 116 177 248 32
It is the running total of the number of observations with a value upto and including the current value.