the average marks of 10 students is 78 the lowest marks of a student is excluded the average is 72 find the lowest marks
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Let n be the number of students who passed the exam.
Let m be the number of students who failed the exam.
Then n+m=75. Since the average mark was 35 the total mark was 75x35=2625. Therefore we also know :
55n+30m=2625
11n+6m=525 Since we know that m=75-n then ;
11n+6(75-n)=525
11n+450–6n=525
5n=75
n=15
m=75–15=60
The number of students who failed is 60.
The number of students who passed is 15
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