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WAEC Mathematics 2010 Paper

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Question : 14

Total: 49

No. of pets	0	1	2	3	4
No. of students	8	4	5	10	3

The table shows the number of pets kept by 30 students in a class. If a student is picked at random ftom the class. What is the probability that he/she kept more than one pet?

$\;\frac{1}{5}$
$\;\frac{2}{5}$
$\;\frac{3}{5}$
$\;\frac{4}{5}$

Solution:

Concept:

Probability is the ratio of favourable outcomes to total outcomes.

Explanation:

A student kept more than one pet if the number of pets is

2

,

3

, or

4

.

Number of students with

2

pets

= 5

Number of students with

3

pets

= 10

Number of students with

4

pets

= 3

Favourable students

= 5 + 10 + 3 = 18

Total students

= 30

Required probability

= \frac{18}{30} = \frac{3}{5}

Answer:

\frac{3}{5}

(Option C)

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