In an experiment with 15 observations on \( \mathrm{x} \), then \( ...

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In an experiment with 15 observations on \( \mathrm{x} \), then
\( \mathrm{P}^{\mathrm{nin}} \) following results were available:

W
\[
\sum \mathrm{x}^{2}=2830, \sum \mathrm{x}=170
\]
One observation that was 20 was found to be wrong and was replaced by the correct value 30 . Then the corrected variance is
(1) 188.66
(2) 177.33
(3) 8.33
(4) 78.00
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