In analyzing hits by certain bombs in a war, an area was partitioned into 555 regions, each with an area of 0.15 km2. A total of 505 bombs hit the combined area of 555 regions. Assume that we want to find the probability that a randomly selected region had exactly two 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.