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In an experiment with 10 observations on...

In an experiment with 10 observations on x the following results are available `Sigmax^(2)=354 and Sigma x=58`. If one observation 8 that was found to be wrong and was replaced by the corrected value 10, then the corrected variance is

A

5

B

3

C

4

D

6

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The correct Answer is:
B
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In an experiment with 9 observation on x , the following results are available Sigmax^(2)=360 and Sigma x=34 . One observation that was 8, was found to be wrong and was replaced by the correct value 10, then the corrected variance is

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The mean of 20 observation is 12. On checking, it was found that two observation were wrongly copied as 3 and 6. If wrong observation are replaced by correct values 8 and 4, then the correct mean is

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The mean and variance of 10 observations are found to be 10 and 5 respectively. On rechecking it is found that an observation 5 is incorrect. If the incorrect observation is replaced by 15, then the correct variance is

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