Frequency of bouncing

Isaac physics question, I would like some help please. I have done up to part F which asks for “The frequency of bouncing heard as a function of bounce number n”. I interpreted this to mean the average frequency of bouncing after n bounces - so I divided n by the total time needed to complete n - 1 bounces. I might have gone wrong in the calculations or misinterpret but i would really appreciate some clarification!
https://isaacphysics.org/questions/maths_ch7_3_q8?board=464cb490-3b10-43cc-af6b-4e66d1545c12&stage=a_level

Thank you, it was much simpler than I was making it lol. Could you explain what the second question is asking: Calculate the frequency of bouncing heard as a function of time T(n) at the nth bounce and t(0)?
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Sounds like its just expressing it in terms of different variables, so rather than expressing it in terms of the index n, put it in terms of T_n which I presume uses the fact its a geometric sequence. But not worked it through again.