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Calulating wave frequency

Hello there

I posted this in physics, but think it might fit well here too as it is a mathematical question.
I've just started introductory physics and am still getting to grips with the basics.
Please might anyone tell me whether I have answered questions i and ii in the following image correctly?

Physics 2 - q1.jpg

i) 3/0.55 (550 milliseconds converted to seconds) = 5.45Hz
ii) 6/0.6 = 10Hz

I'm a bit confused as to what they mean by 'average' firing frequency.

Thank you very much for any advice.

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