Which of the following is the correct formula for arithmetic mean?

\frac{S u m o f a l l o b s e r v a t i o n s}{N u m b e r o f o b s e r v a t i o n s}

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\frac{N u m b e r o f o b s e r v a t i o n s}{S u m o f a l l o b s e r v a t i o n s}

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\frac{N u m b e r o f o b s e r v a t i o n s}{2}

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\frac{N u m b e r o f o b s e r v a t i o n s}{4}

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Solution

The correct option is A $\frac{S u m o f a l l o b s e r v a t i o n s}{N u m b e r o f o b s e r v a t i o n s}$
$A r i t h m e t i c m e a n = \frac{S u m o f a l l o b s e r v a t i o n s}{N u m b e r o f o b s e r v a t i o n s}$

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