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Answered by
4
Step-by-step explanation:
Let x
1
,x
2
,x
3
,x
4
be four observations.
According to question
4
x
1
+x
2
+x
3
+x
4
=20
⇒x
1
+x
2
+x
3
+x
4
=80
After adding ’c’ to each observation the new A.M becomes 22.
⇒
4
(x
1
+c)+(x
2
+c)+(x
3
+c)+(x
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