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In an experiment with 15 observations on...

In an experiment with 15 observations on x, the following results were available `sum x^(2) = 2830, sum 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 :

A

8.33

B

78

C

188.66

D

177.33

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The correct Answer is:
B
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