Question: I would like to ask : does sigma means addition of all items where did the value of 7.5 written in part c come from

I would like to ask :

  1. does sigma means addition of all items
  2. where did the value of 7.5 written in part c come from

I would like to ask :does sigma means addition of allitemswhere did the value of 7.5 written in part c come from

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