Query syntax

Hello,

Can someone explain the different between the two lines of code marked below in terms of the way the grouping is:

with cte as (
 select 
  -1 as kli_kliniknr,
  max(m.MeasurementDate) as MeasurementDate, 
  SUM(NumberOfMeasurements) as NumberOfMeasurements,
  SUM(NumberOfMen) as NumberOfMen,
  SUM(NumberOfWomen) as NumberOfWomen,

  -- What is the difference between these two rows?
  avg( Q1 * NumberOfMeasurements / NumberOfMeasurements) as Q1,
  sum( Q1 * NumberOfMeasurements) / sum(NumberOfMeasurements) as Q1x,

from [BPSD].[dbo].[MeasurementStatisticsPerUnit] m
group by m.MeasurementDate )
 
select * from cte ;

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