Answer:
yes,def=(2399/3713)x100=64.61%
yes,probably= (774/3713)x100=20.85%
yes,probably no= (322/3713)x100=8.67%
yes,def.no= (218/3713)x100=5.87%
Explanation:
Data given
We assume the following frequency table:
Type Frequency
Yes, definitely 2399
Yes, probably 774
No, probably not 322
No, probably not 218
Total 3713
Solution to the problem
And for this case in order to find the percentages we can use the definition of percentage frequency with the following formula:

And using this formula we can find the percentages like this:
yes,def=(2399/3713)x100=64.61%
yes,probably= (774/3713)x100=20.85%
yes,probably no= (322/3713)x100=8.67%
yes,def.no= (218/3713)x100=5.87%