the mean of x1 and x2 is 6 and mean of x1,x2,x3 is 7 find the value of x3
Answers
Answered by
3
(x1+ x2)/2=6
x1+x2=12. ....1
it is given that
(x1+x2+x3)/3=7
x1+x2+ x3=21. ......2
substracting 1 from 2 we get
x1+x2+x3-(x1+x2)=21-12
x1+x2+x3-x1-x2=9
x3=9
hence x3=9
x1+x2=12. ....1
it is given that
(x1+x2+x3)/3=7
x1+x2+ x3=21. ......2
substracting 1 from 2 we get
x1+x2+x3-(x1+x2)=21-12
x1+x2+x3-x1-x2=9
x3=9
hence x3=9
Similar questions