Find the mean of first five multiples of 5.

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Solution

First five multiples of 5 are: 5,10,15,20 and 25.
Mean of the observation = $\frac{S u m o f a l l o b s e r v a t i o n}{T o t a l n u m b e r o f o b s e r v a t i o n}$ = $\frac{5 + 10 + 15 + 20 + 25}{5}$ =15.

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