In an experiment with 15 observations on X, the following results were available \[\Sigma {{x}^{2}}=2830,\] \[\Sigma x=170.\] On observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is

In an experiment with 15 observations on X, the following results were

1.	In an experiment with 15 observations on X, the following results were available \[\Sigma {{x}^{2}}=2830,\] \[\Sigma x=170.\] On observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is
A.	78
B.	\[188.66\]
C.	\[177.33\]
D.	\[8.33\]
Answer» B. \[188.66\]

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In an experiment with 15 observations on X, the following results were available \[\Sigma {{x}^{2}}=2830,\] \[\Sigma x=170.\] On observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is

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