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A class teacher has the following absentee record of \(40\) students of a class for the whole term. Find the mean number of days a student was absent.
| Number of days | \(0-6\) | \(6-10\) | \(10-14\) | \(14-20\) | \(20-28\) | \(28-38\) | \(38-40\) |
| Number of students | \(11\) | \(10\) | \(7\) | \(4\) | \(4\) | \(3\) | \(1\) |
Mean \(=\) days
[Note: Round off the answer to two decimal places and enter the answer.]
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