The following table shows marks in economics of the students of a class. Calculate arithmetic mean.
`{:("Marks",,"Number of Students"),("More than 0",," "30),("More than 2",," "28),("More than 4",," "24),("More than 6",," "18),("More than 8",," "10):}`

Marks in Statistics of the students of Class XI are given below. Find out arithmetic mean. {:("Marks",,"Number of Students"),("Less than 10",," "5),("Less than 20",," "17),("Less than 30",," "31),("Less than 40",," "41),("Less than 50",," "49):}

Following information pertains to the daily income of 150 families. Calculate the arithmetic mean. {:("Income (in Rs.)",,"Number of Families"),("More than 75",," "150),("More than 85",," "140),("More than 95",," "115),("More than 105",," "95),("More than 115",," "70),("More than 125",," "60),("More than 135",," "40),("More than 145",," "25):}

The following table shows the number of marks secured by the students of a class in a 50 marks exam. {:("Score",,"Number of students"),("Less than or equal to 10 marks ",,2),("More than 10 marks and less then or equal to 20 marks" ,,5),("More than 20 marks and less then or equal to 30 marks",,9),("More than 30 marks and less then or equal to 40 marks",,14),("More than 40 marks and less then or equal to 50 marks",,10):} How many students secured less then or equal to 30 marks in that exam ?

For the following distribution the number of students who got marks less than 30 is

Q5. The marks obtained in a class test by 30 students of a class are as follows. Marks obtained Number of students No. earth ats No- ernaun ?ove 49 More than or equal to 1044 38 23 More than or equal to 25 13 More than or equal to 308 More than or equal to 354 More than or equal to 40 2 More than or equal to 5 More than or equal to 15 median l (n More than or equal to 20 Find the: (0) mean marks (i modal marks (ii) median marks. 6. The mode of the following frequency distribution is 36. Find the values of x and