Q. The numbers 3,5,7 and 9 have their respective frequencies x-2,x+2,x-3 and x+3. if the arithmetic mean is 6.5 then the value of x is ?

• 3*(x-2)+5*(x+2)+7*(x-3)+9*(x+3)=24*x+10
  (24*x+10)/(x-2+x+2+x-3+x+3)=6.5
  Therefore x=5
• 9 years agoHelpfull: Yes(24) No(0)
• [3(x-2)+5(x+2)+7(x-3)+9(x+3)]/(x-2+x+2+x-3+x+3) = 6.5
  (24x+10)/4x =6.5
  x=5
• 9 years agoHelpfull: Yes(9) No(0)
• because we have frequencies given .the mean will be
  (3*x-2+5*x+2+7*x-3+9*x+3)/4=6.5
  so by solving we get x=2/3
• 9 years agoHelpfull: Yes(2) No(5)
• 6.5=3 (x-2)+5 (x+2)+7 (x-3)+9 (x+3)/4
  26=3x-6+5x+10+7x-21+9x+27
  26=24x+10
  So x=5
• 8 years agoHelpfull: Yes(2) No(0)
• [ 3*(x-2)+5(x+2)+7(x-3)+9(x3) ] / (x-2)+(x+2)+(x-3)+(x+3)=6.5
  => 24x+10 / 4x =6.5
  => 24x + 10= 26x
  => 26x-24x=10
  => 2x = 10
  => x= 10
• 8 years agoHelpfull: Yes(0) No(3)
• 6.5
  explanation-
  4x=6.5*4
  x=6.5
• 6 years agoHelpfull: Yes(0) No(0)