Question 142

The arithmetic mean of the observations 29, 30, 31, ...., 289 is

Solution

No of terms here is 289-29+1 = 261

$$\therefore\ $$The arithmetic mean of the observations = $$\frac{\frac{261}{2}\left(289+29\right)}{261}$$

= $$\frac{318}{2}$$

= 159

Hence, the correct answer is Option B

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