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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, 20, was found to be wrong and was replaced by the correct value 30. Then the corrected variance is

A

8.33

B

`78.00`

C

188.66

D

177.33

Text Solution

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The correct Answer is:
B
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