Poisson Distribution 1.0 / 5HideShow resource informationMathematicsStatistics, averages and distributionsA2/A-levelCreated by: Sarah GrantCreated on: 23-04-08 20:33 Poisson distributin POISSON DISTRIBUTION No. of events that occur random in an interval (of time or space) X ~Po ( l) Events occur independently “ “ singly Mean = E(X) = m= l “ “ at a constant rate Variance = Var(X) = s2 = l Probability of r P( X = r ) = e-ll or use tables r! Approximation Normal approx Þpoisson X ~Po ( l) ÞX ~N (l, l) 1 of 1
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