Answers

2016-02-10T13:34:35+05:30
Lower limits of class intervals are as follows:- 0-20=0; 20-40=20; 40-60=40; 60-80=60.
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2016-02-10T15:23:54+05:30
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. :-)
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