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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GCSE English Literature 5ET2H 01 17 This is the closing section of a candidateâs response to part (a) of Question 5, focusing on 'A Consumer's Report'. The candidate presents an assured grasp of the way in which the poet presents his attitudes to life, with some interesting and personal analysis of the evidence.heir contact details can be found on this link:www.edexcel.com/teachingservices Get more from your exam resultsâ¦and now your mock results too! ResultsPlus is Edexcelâs free online service giving instant and detailed analysis of your studentsâ exam and mock performance, helping you to help them more effectively.