Question 138 (i)

Earth Science
The table lists the world's 10 largest deserts.

What are the mean, median and mode of the areas listed ?

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Solution

Mean = $\frac{T o t a l a r e a o f a l l d e s e r t s}{N u m b e r o f d e s e r t s} = [\frac{8800000 + 1300000 + 1250000 + 850000 + 580000 + 370000 + 320000 + 310000 + 310000 + 260000}{10}] = \frac{14350000}{10} = 1435000 k m^{2} M e d i a n = \frac{(\frac{N}{2}) t h t e r m + (\frac{N}{2} + 1) t h t e r m}{2} = \frac{\frac{10}{2} t h t e r m + (\frac{10}{2} + 1) t h t e r m}{2} = \frac{5 t h t e r m + 6 t h t e r m}{2} = \frac{580000 + 370000}{2} = \frac{950000}{2} = 475000 k m^{2} [h e r e, N = 10] M o d e = M o s t f r e q u e n t o b s e r v a t i o n = 310000 k m^{2}$

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Question 138 (iv)

Earth Science
The table lists the world's 10 largest deserts.
What percentage of the total area of the deserts listed is in Asia?

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