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The question is asking how many pupil(s) score above the average marks.

So finding the average marks is only the first step.

Average marks = ( 20 + 30 + 10 +50 + 35)/5 = 145/5 = 29

Till now the working is correct for finding the average marks.

So there are 3 pupils scoring more than 29 marks ( 30, 35  and 50 marks scored by 3 pupils).

Answer is 3.

 

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