3
4
XER, X1, X2, X3, then x is equal to
X-2
x-3
x-1
(A) 6/5
(C) 8/5
(B) 775
(D) 9/5
Answers
Answered by
0
Mean =
X
ˉ
=
n
x
1
+x
2
+x
3
+.....+x
n
We have been asked for the algebraic sum of the deviations of each of the observations from the mean, i.e. (x
1
−
X
ˉ
)+(x
2
−
X
ˉ
)+(x
3
−
X
ˉ
)+....+(x
n−1
−
X
ˉ
)+(x
n
−
X
ˉ
)=x
1
+x
2
+x
3
+....+x
n
−n
X
ˉ
=n
X
ˉ
−n
X
ˉ
=0
Hence, option 'A' is correct.
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