Growing average on a graph?

[Anonymous]

I have work order age column, that I plot average for on a line graph, which looks like this:

If I calculate the average for  an entire year, I will get 43.70. How do I add a second line to the graph that shows how the average changes, and ends up at 43.70 as the last point of the graph. So in February it would be average age of all work orders between January and February, then in March, it should be an average age of all work orders between January and March, etc. 

[v-yuezhe-msft]

@Anonymous,

Do you have a calendar table? If not, create a calendar table using DAX below. Then create a relationship using date field of the calendar table and Invoice date of your table.

Calendar=CALENDARAUTO()

Afterwards, create the following measure in your table.

Measure  = CALCULATE(SUM(yourtable[Age]),FILTER(ALL('Calendar'[Date]),'Calendar'[Date]<=MAX('Calendar'[Date])))/MONTH(MAX('Calendar'[Date]))

If above DAX doesn't help, please share sample data of your table and post expected result here.

Regards,
Lydia