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The average of eight observations is 25. If one observation 11 is removed, find the average of the remaining observations.
1. 37
2. 27
3. 77
4. 57

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Correct Answer - Option 2 : 27

Given:

The average of eight observations is 25.

One of the observation 11 is removed

Formula used:

Average = (Sum of observation/Number of observation)

Calculation:

According to the formula, we have

(Sum of 8 observation/8) = 25

⇒ Sum of 8 observation = 25 × 8

⇒ Sum of 8 observation = 200

Now, 11 is removed from the 8 observation

So, the sum of 7 observation = 200 - 11

⇒ 189

So, the average of 7 observation = 189/7

⇒ 27

∴ The average of the remaining observation is 27. 

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