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Multiple choice

If $\sum_{i=1}^{9}{(x_{i}-99)}=27$ and $\sum_{i=1}^{9}{(x_{i}-99)^{2}}=306$ then the mean of the squares of the deviation of $x_{1}, x_{2},..........., x_9$ from their $AM$ is

  1. $9$
  2. $18$
  3. $25$
  4. $12$
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