question_answer

  Since the maximum frequency is 30 and it corresponds to the class 30 - 40, therefore modal class is 30 - 40. Here we know that the mode  is given by  

Answer:

    Find the mode of the following distribution of marks obtained by 80 students :

Marks obtained	0-10	10-20	20-30	30-40	40-50
Number of students	5	11	12	30	22