(begin{array}{cc} 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
Find the median of the observation in the table given

A.
11.5 
B.
12.5 
C.
14.0 
D.
14.5
Correct Answer: Option D
Explanation
Median = L_{1} + ((frac{Ef}{fm})) – fo
(frac{sum f}{2})
= (frac{20}{2})
= 10, L_{1} = 10.5, fo = 6, fm = 5
Median = 10.5 + (frac{(10 – 6)}{5})5
= 10.5 + 4
= 14.5