In an experiment with 15 observations on x the following results were available \\sumx^2 = 2830, \\sumx = 170. One observation 20 found to be wrong was replaced by the correct value 30. Then, the corrected variance is

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In an experiment with 15 observations on x the following results were available Σx2=2830, Σx=170. One observation 20 found to be wrong was replaced by the correct value 30. Then, the corrected variance is

188.66
177.33
8.33
78.00

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