In an examination the distribution of marks obtained by 30 students is given in the following table: Marks (Class-interval) | No. of Students 10 – 25 | 2 25 – 40 | 3 40 – 55 | 7 55 – 70 | 6 70 – 85 | 6 85 – 100 | 6 The mode of the data is