Question

The mean of 13 observations is 14 . If the mean of the first 7 observations is 12 and that of last 7 observations is 16 , find the 7th observations .​

Answer 1

Answer:

Sum of 13 observations :

13×14=182

Sum of first 7 observations :

12×7=84

Sum of second 7 observations :

16×7=112

So the seventh observation :

(84+112) - 182

196 - 182

14