If the class-marks of a frequency distribution are 10.5, 16.5, 22.5, 28.5, 34.5, then the class-size is
6.5
6
5
5.5
Class size = Difference of consecutive mid points = 16.5 - 10.5 = 6
If the class Mark in a frequency distribution are 19.5,26.5,33.5,40.5,47.5,54.5,61.5, then the class size of distribution is
If the class Mark in a frequency distribution are 2.03,2.23,2.43,2.63,2.83,3.03,and 3.23 determine class size and boundaries