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.
If you run up more than $675 (as of April 2016) in debt to any one creditor for luxury goods or services within 90 days before you file for bankruptcy, the law will presume that you had a fraudulent intent. The same is true for cash advances from any one creditor of more than $950 (as of April 2016) during the 70 days before you file for bankruptcy. In either case, if the creditor objects during your bankruptcy case, you will have to prove that you didn't commit fraud or those charges will survive your bankruptcy.