In a certain desert region, the number of persons who become seriously ill each year from eating a certain poisonous plant is a random variable having a Poisson distribution with

\fGeneral probability distribution: Mean or expected value u = E(X) = EX . P(X) Variance 0 = E ( X-/). P(X) Standard deviation o = Vo2 Binomial Distribution: Mean u = n. p Variance 62 = n .p. q Standard deviation = n. p. q X n-X Probability P(X) = "cr.p q for OSX Sn Poisson Distribution: var(x) = ProbabilityP (x) = - x ! for x = 0, 1, 2, 3 ... ... Normal Distribution Probability z =