First slide

Introduction to statistics

Question

The arithmetic of 12 observations is 15. If two observations 20 and 25 are removed then the arithmetic mean of remaining observations is

Moderate

Solution

We have
$\frac{S u m o f t h e o b s e r v a t i o n s}{12} = 15$
$\Rightarrow$ Sum of the observations = 180
Arithmetic mean of new observations = $\frac{180 - 20 - 25}{10} = 135$

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