The mean of 50 observations is 200. But later he found that there is decrements of 9 from each observations. what is the the updated mean is ?  Select the correct option
A) 165  B) 185  C) 190  D) 191  E) 199
191   Answer is 191
<result>D</result>
The mean of 50 observations is 200. But later he found that there is decrements of 9 from each observations. what is the the updated mean is ?