The average of ten numbers is 7 . If each number is multiplied by 12 ,then the average of new set of numbers is :
A) 7 B)19 C) 82 D) 84

• the avg will be = 12*7= 84
• 11 years agoHelpfull: Yes(2) No(0)
• Given (a+b+.....+g)/10=7
  and 12*(a+b+.+g)/10=?
  so 12*70/10=84
  ans. D
• 9 years agoHelpfull: Yes(0) No(0)
• sum of 10 numbers=10*7=70
  X1+X2+.......+X10=70
  and 12X1+12X2+..............+12X10=840
  so,Average of new set=840/10=84
• 9 years agoHelpfull: Yes(0) No(1)