The 1 st Cumulant or moment (a 1) is used to calculate the intensity weighted Z average mean size and the 2 nd moment (a 2) is used to calculate a parameter defined as the polydispersity index (PdI). It is important to note here, that the Cumulants analysis algorithm does not yield a distribution â it gives only the intensity weighted Z average and the polydispersity index.
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Edexcel GCSE You do not need any other materials. Centre Number Candidate NumberWrite your name here Surname Other names Total Marks Paper Reference Turn over Business Studies Unit 3: Building a Business Tuesday 15 June 2010 â Morning Time: 1 hour 30 minutes 5BS03/01 Instructions â¢â¢ Use black ink or ball-point pen.Total for Question  = 14 marks)ToTAL FoR SECTion B = 30 MARKS M37103A_GCSE_Bus_Stud_Unit_3_Jun14 14 30/12/2009 08:45:14. *M37103A010* 15 Turn over BLAnK PAGE M37103A_GCSE_Bus_Stud_Unit_3_Jun15 15 30/12/2009 08:45:15. 1 *M37103A010* SECTion CAnswer ALL the questions.