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Summarized Object = Opportunities
Select Roll-Up Type = SUM
Field to Aggregate = Amount
then check the radio button Only records meeting certain criteria should be included in the calculation
In the criteria add
Stage Equals Closed Won
Create a Roll-up Summary field on the Account object that calculates the SUM of all related Opportunities where Stage = "Closed/Won." Field to aggregate as Amount and Type as SUM
https://success.salesforce.com/answers?id=90630000000h0kBAAQ
Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.
Best Regards,
Sandhya