Calculate Percentage on specific requirement

If one student is giving different series of test and each test carries 400 total marks of each test .

Test 1 : 350
Test 2 : 250
Test 3: 0
Test 4 : 390
Test 5 : 0

Total Marks will 2000 and obtain marks will 990 and percentage will 49.5 %. This is ok .

But I want if student gave 3 tests out of 5 tests then Total marks will be base on  3 tests and percentage should also be base on 3  tests .

Kindly suggest me a formula for excel which can resolve my issue .
Aamir HussainAsked:
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Rob HensonFinance AnalystCommented:
See attached using AVERAGEIF function

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Aamir HussainAuthor Commented:
I am very thankful for your expert opinion .Thats the exact output which i want .
Rob HensonFinance AnalystCommented:
Glad to help.
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