a student calculated avg mark as 76 in 24 subjects. but he put 3 marks incorrectly by reversing the digits of the real mark.
the actual marks were 87.. 79.. and 76.
So the actual avg mark differed from the calculated avg mark by what %
options were:-
1)none of these
2) 2%
3) 8.2%

This qsn i got today in my apti..

• as the differnce between reverse digit number and real numbers is zero...so average will not effect
  87-78+79-97+76-67=9-18+9=18-18=0
  
• 12 years agoHelpfull: Yes(24) No(0)
• avg wl remain same
• 12 years agoHelpfull: Yes(17) No(2)
• let the sum of marks of 21 subjects is x
  then (x+78+79+67/24)=76
  =>x=1582
  then again (x+87+79+76)/24=76
  in both the cases avg ll be same
• 12 years agoHelpfull: Yes(15) No(0)
• avg is same so its 0
• 12 years agoHelpfull: Yes(4) No(0)
• net change=22-9-9=4 marks
  therefore net avg marks=76-(4/24)=75.83
  then find out the % change
• 12 years agoHelpfull: Yes(0) No(11)