1. 

   Minh Ho Very Active Member

   May I know why in this answer Var(S) is not E(N)Var(X) + Var(N)E(X)^2 and skewness is lambda*m3 (not third moment of S)

    

   Minh Ho, May 20, 2023

   #1
2. 

   Busy_Bee4422 Ton up Member

   The formulas used are provided in the tables of formulas under the section on compound distributions

    

   Busy_Bee4422, May 22, 2023

   #2
3. 

   Darren Michaels ActEd Tutor Staff Member

   Indeed - As Busy_Bee says look at page 16 of your formulae book, for a compound Poisson distribution.

    

   Darren Michaels, May 22, 2023

   #3

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