Continuous averaging for a certain amount of time

Hi
In my program I have to use a start button to continuously average a value for a certain amount of time(lets say 3s) and keep and show the average the value. The state of the start button should return to off mode after that 3 sec so if the user hit the start button again it reset the array and calculate the average again.
Would you please help me with this program. I have attached pic of what I ahev done
With this vi I can take data after hitting start for 3 sec but I have these problems:
1- I don't know how to calculate average value when finish getting data after 3 sec
2- I would like the start button back to off mode after 3 sec so if I click on the start button again it reset the array and calculate the average again.
Would u plz help me with this vi?
Attachments:
1q.jpg ‏169 KB

Use mean function to average an array. And wire your time has elapsed boolean to a case structure and reinitialise your boolean control to default in the true case.
Create invoke node as below, just in case you dont know.
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Continuous averaging for a certain amount of time

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