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A class teacher has the following absent...

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. No. of days: 0-6 6-10 10-14 14-20 20-28 28-38 38-40 No. of students: 11 10 7 4 4 3 1

Text Solution

Verified by Experts

We can find the mean using step deviation method.
First, we have to construct a table with given details.
Please refer to video for constructing the complete table.
So, Mean`(barX) = A+(sumf_iU_i)/(sumf_i)**h`
As per the constructed table,
`A = 17,sumf_iU_i = -90.5,sumf_i = 40 and h = 2`
So,Mean`(barX) = 17+(-90.5/40**2)`
`barX = 17-4.525 = 12.475`
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