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

• solution==84
  given:avg of 10 numbers is 7....
  w.k.t avg=sum/total number of elements
  so sum=10*7=70
  if each number is multiplied by 7 -->>sum(12)
  average of new set=(70*12)/10 =840/10 ==84
  ans:-84
• 12 years agoHelpfull: Yes(13) No(1)
• Ans:- 84
  
  If 10 numbers are x1,x2,x3,......,x10, then
  ( x1+x2+x3+......+x10)/10=7
  When each number is multiplied by 12, then
  Average=(x1*12 + x2*12 + x3*12+ .......... +x10*12)/10 =12(x1+x2+x3+....+x10)/10
  =12*7
  =84
• 8 years agoHelpfull: Yes(1) No(0)
• D)84
  EXPLANATION:
  consider the number as x so for ten numbers the average will be as 7 so 10x/10=7 so the value of X IS 7 AND HENCE THE VALUE OF x is multiplied by 12 so the number will be as 840 and the average will be 840/10 =84
• 7 years agoHelpfull: Yes(0) No(0)
• avg of ten number is 7, then sum of those ten number will be 70. Each number is mulitplied by 12 so 12 can be taken commen from all ten number which give 12*(sum of ten number ) will be 840. so the answer is 84
• 7 years agoHelpfull: Yes(0) No(0)
• ans:84
  because avg of ten numbers is 7 and If each number is multiplied by 12 means directly we can multiply by the average num..so 7*12=84
• 7 years agoHelpfull: Yes(0) No(0)
• d.12*7=84
• 7 years agoHelpfull: Yes(0) No(1)
• (a+b+c+d+e+f+g+h+i+j)/10=7
  ((a+b+c+d+e+f+g+h+i+j)*12)/10=84
• 5 years agoHelpfull: Yes(0) No(0)