I'm having problems following your post but I would suggest you are after:
(the ones that aren't good)/(the total number of radios)
If there is a random sample taken of radios, and some of them are in excellent, good, bad, and some are really bad conditions. What proportion of these radios need fixed? (the ones that aren't good)
For example I have 6 in bad condition, and 2 In really bad condition.
So the relative frequency for the bad ones are .0266
..and the relative frequency for the really bad ones are .08
I know the Cumulative frequency is .1067
I'm not sure what to answer when "what is the proportion "is asked?
thanks.