the mean marks of a student in 7 theory papers is 62.what should be the mean marks in 3 practical examination so that his mean marks for the entire examination is 68. ( the marks of each theory paper and practical examination are same)?
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Step-by-step explanation:
Mean = Sum of marks / N
62 = Sum / 7
Sum of marks in 7 theory papers = 62 x 7 = 434
Let the Sum of the marks of 3 practical papers be y
Total sum = 434 + y
Number = 10
Mean = 68
68 = (434 + y)/10
680 = 434 + y
y = Sum of marks in 3 practical exams = 246 marks
mean in the 3 practical exams needed = 246/3 = 82
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