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One hundred students appeared in the biostatistics examination. The results of those who secured less than 80% marks are given below. Find the average marks

One hundred students appeared in the biostatistics examination. The results of those who secured less than 80% marks are given below. Find the average marks of those who secured more than 80% marks.

Marks 0-20 20-40 40-60 60-80

No. of students 16 24 20 10

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