nt) Given that x is a random variable having a Poisson distribution, compute the following: \text { (a) } P(x=7) \text { when } \mu=0.5 P(x \leq 6) \text { when } \mu=4.5 \text { c) } P(x>3) \text { when } \mu=5.5 P(x<9) \text { when } \mu=4.5