Question

Let $m$ be the mid-point and $l$ be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is:

• A. $2m+l$
• B. $2m-l$
• C. $m+l$
• D. $m+2l$

Answer 1

Answer: (B)

$2m-l$

Let $a$ be lower class limit, $l$ is the upper class limit and $m$ is the mid-point
then, mid-point $m=\frac{a+l}{2}$
Therefore, $a=2m-l$