A) Remains the same .
B) Increases by 5.
C) Decreases by 5.
D) Becomes half.
Correct Answer: B
Solution :
Let the observations be \[{{x}_{1}},{{x}_{2}},.....{{x}_{n}}.\] After the increase they are \[{{x}_{1}}+5,\,{{x}_{2}}+5,....{{x}_{n}}+5\]. A.M. \[=\frac{{{x}_{1}}+5+{{x}_{2}}+5+....+{{x}_{n}}+5}{n}\] = A.M. before increase \[+5\].
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