Question

lower limit of the class interval 0-20'20-40'40-60'60-80

Answer 1

Lower limits of class intervals are as follows:- 0-20=0; 20-40=20; 40-60=40; 60-80=60.

Answer 2

Lower limts of these numbers are 0, 20, 40, 60 respectively. It is the starting number in a class interval. Hope it helps and pls mark as the best answer. :-)