statistics

the following information relates to the age of death of 50 persons in an area:

36,43,47,38,37,48,40,48,41,49,50,32,53,49,53,45,41,37,45,51,49,39,48,36,54,31,39,50,39,59,50,43,41,31,48,48,47,49,48,38,

42,45.50,59,39,57,52,53,48,45.

if the class intervals are 31-33,34-36,...... then the percentage frequency for the last five class intervals are?