Construct one table that includes relative frequencies based on the frequency distributions shown bellow, then compare the amounts of tar in...

Construct one table that includes relative frequencies based on the frequency distributions shown bellow, then compare the amounts of tar in nonfiltered and filtered cigarretes. Do the cigarrete filters appear to be effective? Complete the relative frequency table bellow.

tar (mg)     relative freq nonfiltered     relative freq filtered

3-6                ______%                                   ______%

7-10              ______%                                   ______%

11-14             ______%                                   _______%

15-18            _______%                                 ________%

19-22            _______%                                 ______%

23-26          ________%                               _________%

27-30          _______%                                 _______%

I need help on how to figure the percentages out. So, that I will know how to do this on my own.