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In a data with 15 number of observations...

In a data with 15 number of observations `x_(1), x_(2), x_(3), ..., x_(15), sum_(i=1)^(15) x_(i)^(2)=3600` and `sum_(i=1)^(15) x_(i)=175`. If the value of one observation 20 was found wroung and was replaced by its correct value 40, them the correct variance of that data is

A

151

B

149

C

145

D

144

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The correct Answer is:
A
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