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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 student was 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.

Number of days: 0-6 6-12 12-18 18-24 24-30 30-36 36-40
Number of students: 10 11 7 4 4 3 1

 

 

 

 
 
 
 
 

Answers (1)

No. of days No. of students (fi) xi fixi
0-6 10 3 30
6-12 11 9 99
12-18 7 15 105
18-24 4 21 84
24-30 4 27 108
30-36 3 33 99
36-42 1 39 39
Total 40   564

\begin{align*}\mathrm{\bar{x}} & \ \mathrm{= \frac{\Sigma f_ix_i}{\Sigma f_i} = \frac{564}{40}} \\ & \ \mathrm{= 14.1} \end{align*}

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Safeer PP

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