I'm not exactly sure what you mean but one interpretation of what you are saying could be:
(SUM(IF(Date) = April 2016 THEN [HoursInSeconds] end) + SUM(IF(Date) = April 2016 THEN [MinsInSeconds] end) + SUM(IF(Date) = April 2016 THEN ([Seconds]) end)) / 3600
I don't know what you mean by number of records though.
Sorry, I realise now I wasn't very clear with my description.
So say for example, I have two datasets, one for number of incidents and one for Time spent raising these incidents.
The number of incidents is the count of the reference numbers.
What I am trying to do is add up the total number of time spent on the incidents divided by the number of records of incidents we have.
The number of records part is just 1 per incident. So I want the calculation to add up the time and divide by the total number of records.
I need this, but for April 2016 only. Currently, I have incidents going back to 2011, So I want to 'filter' the number of records within the calculation to only add up the number of records for April 2016.
So SUM(All of the seconds) / 3600 to convert it back to hours, / by number of incident records for April 2016 only.
It's quite hard to explain and as I am on a work machine it's hard for more to attach a workbook.
If you can help that would be great as I have hit a brick wall