Test Index

JAMB Mathematics 2013 Paper

Question : 25

Total: 47

Age	20	25	30	35	40	45
No. of people	3	5	1	1	2	3

Solution:

Concept:

For an ordered frequency distribution, the median is the

\frac{N+1}{2}

th value when

N

is the total frequency.

Explanation:

Total number of people:

N = 3 + 5 + 1 + 1 + 2 + 3 = 15

Since

N = 15

is odd, the median position is

\frac{15+1}{2} = 8

th value.

Cumulative frequencies:

3, 8, 9, 10, 12, 15

The 8th person falls in the age group

25

Therefore, the median age is

25

years.

Answer:

25

years (Option A).

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