In an experiment with 15 observations the following results were available :  Σx2=2830,Σx=170One observation that was 20 was found wrong and was replaced by the correct value 30. The corrected variance is

In an experiment with 15 observations the following results were available : 

 Σx2=2830,Σx=170

One observation that was 20 was found wrong and was replaced by the correct value 30. The corrected variance is

  1. A

    8.33

  2. B

    78.00

  3. C

    188.66

  4. D

    177.33

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    Solution:

    We have,

     Corrected Σx2=2830202+302=3330

    Corrected Σx=17020+30=180

      Corrected Variance =333015180152=78

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