In a class exactly 10% students get 70 marks, exactly 25% get 80 marks, exactly 15% get 85 marks, exactly 25% get 90 marks and remaining get 95 marks.what is the minimum number of students in the class if the avg. of sum of marks is an even no.
Choose one
A) 20  B) 80  C) 100  D) 120  E) 200
Let total no. of students be x   (x(10*70 + 25*80 + 15*85 + 25* 90 + 25*90)/100)/ x = 86   Hence the avg is always 86 and does not depend upon the no. of students.   Hence the answer is the minimum value that is 20   20NSWER:20
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In a class exactly 10% students get 70 marks, exactly 25% get 80 marks, exactly 15% get 85 marks, exactly 25% get 90 marks and remaining get 95 marks.what is the minimum number of students in the class if the avg. of sum of marks is an even no.