The African Tigerfish Can Jump Out of Water to Catch

Multiple Choice

The African tigerfish can jump out of water to catch barn swallows flying low over a lake. A study found that, during summer time, 20 birds were caught per day on average by tigerfish in Schroda Dam Lake. Let X be the number of birds caught in flight by tigerfish in Schroda Dam Lake in a day. Assuming that catches are random and independent, we use a Poisson distribution with a mean of 20 to describe the probability distribution of X.
What is the probability that X is exactly 20?

A) 0.050
B) 0.089
C) 0.500
D) 1.000