Consider the cow a sphere

My statistics textbook prides itself on using real world examples in its problems.  I could tell for the current lesson on large sample sizes when a question began “During a football game, a gust of wind caused 1/2 the number of spectator’s to lose their hats.  Assuming the lights didn’t work, find a function that for a number n, that 1/4 of them would get hats back assuming the hats are distributed both randomly and independently.”