Elitmus
Exam
Numerical Ability
Arithmetic
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 ?
Read Solution (Total 6)
-
- 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 - 9 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 - 9 years agoHelpfull: Yes(0) No(3)
- 6.5
explanation-
4x=6.5*4
x=6.5 - 7 years agoHelpfull: Yes(0) No(0)
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