How to get total and average csll time durstion

[#1]

Hi all,

I have three categories, for each category i have duration in hh:mm:ss availabe in 400 rows so eventually i have 1200 rows data and two columns, now i want total call duration and average for each category.

How to calculate?

[swuehl]

Please avoid posting the same question multiple times, this makes it hard to follow a discussion.

I've answered here:

Total and average call duration