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The mean of 18 observation is 8. If one more observation whose value is 27 is added, then new mean become x. Find the value of x.

The mean of 18 observation is 8. If one more observation whose value is 27 is added, then new mean become x. Find the value of x. Correct Answer 9

Given:

Mean of 18 observation is = 8

Formula:

Average = Sum of all observations/Total number of all observations

Calculation:

Sum of 18 observation = 18 × 8 = 144

According to the question

(144 + 27)/19 = x

⇒ 171/19 = x

∴ x = 9 

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