Let `l` be the lower class limit of a class-interval in a frequency distribution and `m` be the mid-point of the class. Then, the upper class limit of the class is `m+(l+m)/2` (b) `l+(m+1)/2` (c) `2m-l` (d) `(m-2l)`

Explanation

`l` is the lower class limit of a class interval m is the mid point of the class
`m=(u+l)/2`
`=u+l=2m`
`u=2m-l`
Then, upper class limit
=`2m−l`