1.

1). 162). 83). 64). 12

Answer»

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



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