This question was asked in Ex 14.1, 3
Hlw sir..
This is nehašŸ˜‹
I have doubt in this chapter  that  how can we know that where  class  mark  and  class size are to be used
Plzz  tell  this  ..... I really  don't  understand 
I am confused. 
Even my boards  are coming  7th march
Pragati Reddy's image