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BECE Mathematics 2015 Paper

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Question : 18

Total: 40

The ages in years of 10 children at a party are 2,3,3,3,4,4,5,5,5 and 6 . If a child is chosen at random, what is the probability that he or she is not less than 5 years old?

$\frac{2}{3}$
$\frac{2}{5}$
$\frac{3}{10}$
$\frac{1}{2}$

Solution:

\text{ Probability } = \frac{\text{ Number of possible selection }}{\text{ Total number of samples }}

The ages not less than 5 years old are

5,5,5

and 6

Number of possible selection

=4

( 4 children with ages not less than 5 )

Total number of samples

=10

children

\text{ Probability } = \frac{4}{10} = \frac{2}{5}

Note: 2 divides 4,2 times and 10, 5 times

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