How do I average MySQL result set -

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i have mysql query tells me difference between status change entries:

select      t1.`trackid` ticketnumber,     timediff(t2.`date`, t1.`date`) difference     hesk_history t1     join hesk_history t2 on t2.`trackid` = t1.`trackid` , t1.`action` = 'created' , (t2.`action` = 2)

gives me following result set:

ticketnumber    difference 2013-08-12-36   410:21:25 2013-06-12-91   00:01:22 2013-08-12-50   00:00:26

how avg result set?

http://www.w3schools.com/sql/sql_func_avg.asp in case

select avg(t1.trackid ticketnumber, timediff(t2.date, t1.date)) difference hesk_history t1 join hesk_history t2 on t2.trackid = t1.trackid , t1.action = 'created' , (t2.action = 2)


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