Following are the heights of 20 students $( in\ cm)$:
$155,\ 158,\ 152,\ 147,\ 153,\ 162,\ 144,\ 148,\ 141,\ 150,\ 157,\ 145,\ 161,\ 154,\ 142,\ 163,\ 154,\ 160,\ 155,\ 143$
Make a frequency distribution table for this data using equal class-intervals, one of them being $140-145$.

Given: Heights of $20$ students $( in\ cm)$:

$155,\ 158,\ 152,\ 147,\ 153,\ 162,\ 144,\ 148,\ 141,\ 150,\ 157,\ 145,\ 161,\ 154,\ 142,\ 163,\ 154,\ 160,\ 155,\ 143$

To do: To make a frequency distribution table for this data using equal class-intervals, one of them being $140-145$.

Solution:

 The table  is as below:

Class Interval	Frequency of students
$140-145$	4
$140-150$	3
$150-155$	5
$155-160$	4
$160-165$	4