Now imagine that the same plastic tube with 150 fruit flies

Now imagine that the same plastic tube, with 150 fruit flies in the center, is marked into four sections of equal length. The flies are able to easily enter any of the four sections. If the flies are actually indifferent to the banana on one side and randomly move around the tube, how many individuals do you expect to find in each section after some time has passed? Do not round your numbers.

Solution

The flies may be expected to distribute themselves randomly (somewhat equally) throughout the tube. Therefore, the number of flies expected to be present per section is 150/4 = 37.50.