Question

The median for the data is :

$\begin{array}{cccccccc}\text{IQ}& 60-70& 70-80& 80-90& 90-100& 100-110& 110-120& 120-130\\ \text{No. of pupils}& 2& 3& 5& 16& 14& 13& 7\end{array}$

• A. 102
• B. 100
• C. 105
• D. 104

Answer 1

The correct option is A

102

n = 60

The median for grouped data is given by $\frac{n}{2}$ = $\frac{60}{2}$ = 30th Observation

$\begin{array}{ccc}\text{Class Interval}& \text{Frequency}& \text{Cumulative Frequency}\\ 60-70& 2& 2\\ 70-80& 3& 5\\ 80-90& 5& 10\\ 90-100& 16& 26\\ 100-110& 14& 40\\ 110-120& 13& 53\\ 120-130& 7& 60\end{array}$

As we can see from the graph , The 30th observation on the y - axis when extended to the Ogive, corresponds to an Observation on

x - axis which is equal to 102.

$\therefore$ The median is 102.