The average weight of 29 students is 28 kg. By the admission of a new student, the average weight is reduced to 27.2 kg. The weight of the new student is Select.
A) 4 kg  B) 21.6 kg  C) 22.4 kg  D) 21 kg  E) None of these
Exp . The total weight of 29 students = 29* 28   The total weight of 30 students = 30* 27.2   Weight of the new student = ( 30*27.2 – 29*28)   = 816 - 812= 
<gadget id="calculator">816 - 812</gadget>
<output>4</output>
4   4 kgnswer:4 kg
<result>A</result>
The average weight of 29 students is 28 kg. By the admission of a new student, the average weight is reduced to 27.2 kg. The weight of the new student is