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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.

8.  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.

     

Answers (1)

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Number of

days

Number of

Students f_i

Class mark

x_i

 f_ix_i
0-6 11 3 33
6-10 10 8 80
10-14 7 12 84
14-20 4 17 68
20-28 4 24 96
28-38 3 33 99
38-40 1 39 39
       
 

\sum f_i 

=40

  

\sum f_ix_i

=499

Mean, 

\overline x = \frac{\sum f_ix_i}{\sum f_i}
= \frac{499}{40} = 12.475\approx 12.48
Therefore, the mean number of days a student was absent is 12.48 days.

Posted by

HARSH KANKARIA

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