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A class teacher has the following absent...

A class teacher has the following absentee record of 40 student 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):}`

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The correct Answer is:
12 . 48 days
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