A muffin with raisins may be viewed as part of a three-dimensional Poisson process with raisins as the points. How many raisins does a muffin need to contain, on the average, in order to make the...

A muffin with raisins may be viewed as part of a three-dimensional Poisson process with raisins as the points. How many raisins does a muffin need to contain, on the average, in order to make the probability that a muffin contains no raisins at most 0.05? What objection can you find against the use of a Poisson process for raisins muffins?