Ex 14.1, 8 (Method 1 β Direct Method)
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.
Here Class Size is not same,
So, we solve by Direct Method
Putting values in formula
Mean(π₯ Μ ) = (ββπππ₯π)/(ββππ)
π₯ Μ = 499/40
π Μ = 12.48
Therefore, Mean number of days a student was absent is 12.48 daysEx 14.1, 8 (Method 2 β Step Deviation Method)
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.
Here Class Size is not sameβ¦
So, in Step Deviation Method
Mean(π₯ Μ ) = a + h Γ (ββππππ)/(ββππ)
We use a value of h which can divide
ππ = π₯π β a
Mean(π₯ Μ ) = a + h Γ (ββππππ)/(ββππ)
Where
a = Assumed Mean
Let h = Class interval
Also,
ββππ = 40
ββππππ = β90.5
Putting values in formula
Mean(π Μ ) = a + h Γ (ββππππ)/(ββππ)
π₯ Μ = 17 + 2 Γ (β90.5)/40
π₯ Μ = 17 β 4.525
π Μ = 12.475
Therefore, Mean number of days a student was absent is 12.48 days

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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