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Ex 13.1, 8 (Method 1 – 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 𝑥 ̅ = 499/40 𝒙 ̅ = 12.48 Therefore, Mean number of days a student was absent is 12.48 days Ex 13.1, 8 (Method 2 – 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. Ex 13.1, 8 (Method 2 – 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. Mean(𝑥 ̅) = a + h × (∑▒𝒇𝒊𝒖𝒊)/(∑▒𝒇𝒊) Where a = Assumed Mean Let h = Class interval Also, ∑▒𝒇𝒊 = 40 ∑▒𝒇𝒊𝒖𝒊 = −90.5 Putting values in formula Mean(𝒙 ̅) = a + h × (∑▒𝒇𝒊𝒖𝒊)/(∑▒𝒇𝒊) 𝑥 ̅ = 17 + 2 × (−90.5)/40 𝑥 ̅ = 17 – 4.525 𝒙 ̅ = 12.475 Therefore, Mean number of days a student was absent is 12.48 days

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo