The Total solution for NCERT class 6-12
Here the maximum class frequency is 80,and the class corresponding to this frequency is 5-7.So, the modal class is 5-7.l (lower limit of modal class) = 5f1 (frequency of the modal class) = 80f0 (frequency of the class preceding the modal class) = 45f2(frequency of the class succeeding the modal class) = 55h (class size) = 2