There were 50 students in a class. 10 failed whose average marks were 2.5. The total marks of class were 281. Find the average marks of students who passed? (a) 6.4 (b) 25 (c) 256 (d) 86
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Total number of student = 50
number of failed student = 10
total marks obtained by failed student = 2.5 × 10
25 marks
number of passed student = 50 - 10
= 40
marks obtained by passed student = 281 - 25
256
therefore the average marks of a student who passed = (256/40) marks
= 6.4 marks
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this is the method our teacher taught.
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