There are a set of kids (N kids) asked to sit in a row of seats, leaving at least one empty seat between them until all seats are filled. At the end, how do I calculate mean of the fraction of occupied seats? What will be the input to calculate mean?

What do YOU think ?
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Thanks for the reply.

Here is my understanding. Let's say there are 30 seats and by leaving at least one seat empty, there will be 15 occupied seats. Since I need to calculate mean for the fraction of occupied seats, it will be mean for 1/30, 2/28... etc. Please correct my understanding.