We'll leave this query here for the time being. If it doesn't get much in the way of useful responses, we might look at moving it to Questions.
A difficult question as, for maximum braking, you would put everyone through the next seatback and for the range from nil to max braking is pretty broad.
Possibly you might do better with your assignment running the sums for the autobrake settings and qualifying your answers by reference to those values as examples within the available range. The other problem with the question is that, while the autobrake generally is set up to maintain a constant decel until the aircraft is stopped, the human pilot will modulate brake pressure throughout the stop with an associated varying decel.