The following table shows the marks scored by 140 students in an examination of a certain paper: Marks:                0-10     10-20     20-30     30-40      40-50 No. of students:   20          24          40          36            20 Calculate the average marks by using the assumed mean deviation method.

Following are the marks obtained by 30 students in a examination Taking class intervals 0-10, 10-20,….. 40-50 construct a frequency table.

The following table gives the marks scored by 100 students in an entrance examination. Marks: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 No. of Students (Frequency): 4 10 16 22 20 18 8 2 Represent this data in the form of a histogram.

Find the deviation from the mean and from median of the following distribution: Marks 0-10 10-20 20-30 30-40 40-50 No. of Students 5 8 15 16 6

The following table gives the marks scored by 378 students in an entrance examination : Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 No. of Students 3 12 36 76 97 85 39 12 12 6 From this table form (i) less than series, and (ii) the more than series.

Marks of 40 student in a test out of maximum 50 marks are as follow :

Find the mode of the following frequency table, which gives the marks scored by 40 students in a test:

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 No. of students 6 10 12 32 20

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 No. of students 6 10 12 32 20

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 No. of students 6 10 12 32 20

Following table shows the marks scored by a group of 90 students in a mathematics test of 100 marks. Marks 0-20 20-30 30-40 40-50 50-60 60-70 70-100 No. of Students: 7 10 10 20 20 15 8 Find the probability that marks scored by a student in the class is: at most 60 marks (ii) at least 60 marks (iii)not more than 50 marks