1 Relative frequency: the result of dividing the absolute frequency of a certain value by the total number of data.  The sum of the relative frequencies is equal to $$1$$. We can prove this easily by factorizing $$N$$. Cumulative frequency: the sum of absolute frequencies of all the values equal to or less than the considered value.
Having said that you should have to wait 8 years from the last FILING DATE of your previous bankruptcy. The old time period prior to 2005 was 7 years before you could file again, but that was expanded to 8 years after the Bankruptcy Abuse and Consumer Protection Act of 2005 was passed.
For individuals, the most common type of bankruptcy is a Chapter 13. You must file all required tax returns for tax periods ending within four years of your bankruptcy filing. During your bankruptcy you must continue to file, or get an extension of time to file, all required returns.