From the table given above, the average life expectancy (in years) of the people living on the island is

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Solution

The correct option is C 70

The table contains ages of 20 people living on the island.

Sum of ages of all the 20 persons will be:
$= 55 + 65 + 56 + 84 + 71 + 54 + 81 + 70 + 67$
$+ 78 + 71 + 73 + 82 + 73 + 74 + 62 + 90$
$+ 47 + 66 + 81 = 1400 y e a r s$

Mean of a data is goven 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,
$M e a n = \frac{S u m o f a g e s o f a l l t h e p e o p l e}{N u m b e r o f p e o p l e}$
$= \frac{1400}{20}$ years
$= 70$ years

∴ Average age of the people living on the island is 70 years.

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Country	India	Japan	Britain	Ethiopia	Cambodia
Lifeexpectancy (in years)	65	80	75	50	45

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Life expectancy (in years)	76	57	70	43	36

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