I have my calculations for Average Monthly Employees as follows
Total Employee = CALCULATE(SUM(Employee[Total Employee ]),LASTDATE('Date'[Date]))
Total employee previous month = CALCULATE([Total Employee],DATEADD('Date'[Date],-1,MONTH))
Average monthly Employee = IF([Total employee previous month]=0,[Total Employee],
[Total Employee]+[Total employee previous month])/2
But what we need for Average Quarterly Employee is
(Employee[Total Employee Month 1]+ Employee[Total Employee Month 2]+Employee[Total Employee Month 3])/3
Please advise