From the table, the average age of the people living on the island is .

58 years

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65 years

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69 years

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74 years

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Solution

The correct option is C 69 years
The table contains ages of 10 people living on the island.

Sum of ages of all the 10 persons will be:
$= 55 + 61 + 72 + 69 + 77 + 58 + 63 + 81 + 72 + 82$ years
$= 690 y e a r s$

You know, mean of a data is given by:

$M e a n = \frac{S u m o f v a l u e s}{N u m b e r o f v a l u e s}$

So, $M e a n = \frac{S u m o f a g e s o f a l l t h e p e o p l e}{N u m b e r o f p e o p l e}$

$= \frac{690}{10}$ years

$= 69$ years

∴ Average age of all the people living on the island is 69 years.

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