Consider the marks obtained (out of 100 marks) by 30 students of Class IX of a school:
Find the mean of the marks obtained by 30 students of Class IX of a school.

Consider the marks out of 100, obtained by 51 students of a class in a test, given in table below: Draw a historigram and frequency polygon for the above data.

The marks obtained of a class of 80 students are given below Construct a histogram to represent the data above.

The adjoining pie chart gives the marks scored in an examination by a student in Hindi,English,Mathematics,Social Science and Science .If the total marks obtained by the students were 540,answer the following questions: How many more marks were obtained by the student in Mathematics than in Hindi ?

The distribution below gives the weights of 30 students of a class. Find the median weight of the students.

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

The following data is of the ages(in years) of 20 students of class VI.Arrange the data in a table using tally marks. How many students are 10 years of age?

Let U be universal set of all students of class XI of a co-educational school and A be the set of all girls in class XI. Find A’.

Find the mean marks by using assumed mean method secured by 140 students in statistics.