Find the day of average absence of each and every student from the following given table :

Explanation

Here, the upper bundaries of the class-intervals and less than type cumulative frequencies are given . At first, the following table is to be prepared :

`therefore baru=(sum u.f)/(sum f)=(-40)/(630)=-(4)/(63)=-0.0635` (approx.)
`therefore barx=12+5baru=12+5(-0.0635)=12-0.3175=11.6825`
`therefore ` The average absence of the students =11.68 days