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begin array c c Class amp Frequency hline 1 - 5... - JAMB Mathematics 1993 Question

(\begin{array}{c|c} Class & Frequency\ \hline 1 - 5 & 2\6 - 10 & 4\11 - 15 & 5\16 - 20 & 2 \ 21 - 25 & 3\26 - 30 & 2\31 - 35 & 1\36 - 40 & 1 \end{array})

Find the median of the observation in the table given

A
11.5
B
12.5
C
14.0
D
14.5
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Correct Option: D

Median = L1 + ((\frac{Ef}{fm})) - fo

(\frac{\sum f}{2})

= (\frac{20}{2})

= 10, L1 = 10.5, fo = 6, fm = 5

Median = 10.5 + (\frac{(10 - 6)}{5})5

= 10.5 + 4

= 14.5

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