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Find the mean marks of the students for the following distribution:
| Marks | Number of Students |
| \(0 and above\) | \(80\) |
| \(10 and above\) | \(77\) |
| \(20 and above\) | \(72\) |
| \(30 and above\) | \(65\) |
|
\(40 and above\)
|
\(55\) |
| \(50 and above\) | \(43\) |
| \(60 and above\) | \(28\) |
| \(70 and above\) | \(16\) |
| \(80 and above\) |
\(10\)
|
| \(90 and above\) | \(8\) |
| \(100 and above\) | \(0\) |
Answer:
The mean mark of the student is .
[Note: Enter the answer in to two decimal number.]
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