The mean of 50 observations is 100. But later he found that there is decrements of 13 from each observations. what is the the updated mean is ?  Choose the correct choice from the following options:  A) 87  B) 97  C) 67  D) 57  E) 46
87   87nswer is 87
<result>A</result>
The mean of 50 observations is 100. But later he found that there is decrements of 13 from each observations. what is the the updated mean is ?