Question

The following table gives the life time of 200 neon lamps. Find the median class.

• A. 2500 - 3000
• B. 1000 - 1500
• C. 1500 - 2000
• D. 3000 - 3500

Answer 1

The correct option is A 2500 - 3000


The median class is identified as the class whose cumulative frequency will be greater than $\frac{n}{2}$, where 'n' is the sum of the frequencies. (n=200).
Next, we divide 200 by 2.

$\frac{n}{2}=\frac{200}{2}=100$

We now locate the class whose cumulative frequency is greater than 100.
"2500 - 3000" is the class whose cumulative frequency 155 is greater than 100.
$\therefore$The median class is 2500 - 3000.