It is clearly mentioned in the question that each bottle of ibuprofen has 1000 pills.
Now, 1/4 bottle of ibuprofen is used to make the prescription.
So, if one bottle of ibuprofen has 1000 pills and 1/4 1/4 bottle of ibuprofen is used to make the prescription, then Jerome obviously used pills of ibuprofen to make the prescription.
because people who play basketball are generally taller which means they have bigger feet (most of the time) which doesn't accurately represent the average of the male student body.