Find the arithmetic mean of the following data:

2, 3, 4, 5, 6, 7, 8, 9

___.

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Solution

The arithmetic mean

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

$=$ $\frac{2 + 3 + 4 + 5 + 6 + 7 + 8 + 9}{8}$

$=$ $\frac{44}{8}$

$=$ $5.5$

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