# Mean of 15 observation is 200. If one observation is excluded, their mean is 198. Find the value of excluded observation.

Mean of 15 observation=200

$\Rightarrow$ Total sum of 15 observations= $15\times 200=3000$

On excluding an observation, the mean of remaining 14 observations is 198
$\therefore$ Total sum of remaining 14 observations = $14\times 198=2772$

$\Rightarrow$ Excluded observation = Total of 15 observations - Total of remaining 14 observations

$\Rightarrow 3000-2772=228$

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