Question

The mean of eight observations is 12. A new observation 21 is included. Then, the

mean of all these 9 observations is

Please answer fast ​

Answer 1

Mean of eight observations is 25 . If one observation 11 is excluded, find the mean of the remaining

Let

Answer 2

Answer:

8 observations mean is 12

then 12×8= 96

then add 21 into 96

we get. 117

mean of 9 observations is 117/9= 13

then mean of 9 observations is *13*