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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 stu

By Elliana

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 with step deviation method
Number of 0 – 6, 6 – 10 ,10 – 14, 14 – 20, 20 – 28, 28 – 38, 38 – 40
days
Number of 11, 10, 7, 4, 4 ,3, 1
students

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Elliana

जो बीत गयी सो बात गयी कविता का सारंश please give brief imformation long answer ​

evaluate 3 [ 2 -4 3] matrix
2
1 ​

2 thoughts on “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 stu”

  1. Step-by-step explanation:

    To find the class mark (x i ) for each interval, using the following relation:

    (x i ) = Upperclasslimit+Lowerclasslimit

    2

    Taking 17 as assumed mean (a), calculating di

    and fi d i as:

    From the table:

    ∑fi = 40

    ∑fi di = −181

    Mean, xˉ = a+ ∑fi di

    ∑fi

    = 17 + ( – 181 )

    40

    =17−4.525

    =12.475

    ≈12.48

    Therefore, the mean number of days =12.48 days for which a student was absent.

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