The arithmetic of 12 observations is 15. If two observations 20 and 25 are removed then the  arithmetic mean of remaining observations is  

The arithmetic of 12 observations is 15. If two observations 20 and 25 are removed then the  arithmetic mean of remaining observations is  

  1. A

    14.5

  2. B

    13.5

  3. C

    12.5

  4. D

    13

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    Solution:

    We have

       Sum of the observations12=15

        Sum of the observations = 180

    Arithmetic mean of new observations = 180202510=135

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