In analyzing hits by certain bombs in a war, an area was partitioned into 565 regions, each with an area of 0.25 km2. A total of 525 bombs hit the combined area of 565 regions. Assume that we want to find the probability that a randomly selected region had exactly four hits. In applying the Poisson probability distribution formula, P(x)equalsStartFraction mu Superscript x Baseline times e Superscript negative mu Over x exclamation mark EndFraction , identify the values of mu, x, and e. Also, briefly describe what each of those symbols represents.