Question

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.

Answer 1

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`