The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. Then find the 11th observation?
Given that mean of 10 observations is 17
∴ Sum of 10 observations = 170
Also given that when one observation is included the new mean is 16
∴ mean of 11 observations = 16
∴ Sum of 11 observations = 11 × 16 = 176
11th observation = sum of 11 observations - sum of 10 observations = 176 - 170 = 6