The AM of n observations is M. If the sum of (n – 4) observations is a ,then the mean of remaining four observations is 

The AM of n observations is M. If the sum of (n - 4) observations is a ,then the mean of remaining four observations is 

  1. A

    nMa4

  2. B

    nM+a2

  3. C

    nMa2

  4. D

    nM+a

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    Solution:

    Let x1,x2,,xn be n observations.

     M=x1+x2+x3++xnn =x1+x2++xn4+xn3+xn2+xn1+xnnM=a+xn3+xn2+xn1+xn nMa4=xn3+xn2+xn1+xn4

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