Class intervals in a grouped frequency distribution are given as 4 – 11, 12 – 19, 20 – 27, 28 – 35, 36 – 43. Write the next two class intervals. (i) What is the length of each class interval? (ii) Write the class boundaries of all classes, (iii) What are the class marks of each class?

Given below are the ages of 45 people in a colony.

33 8 7 25 31 26 5 50 25 48 56

33 28 22 15 62 59 16 14 19 24 35

26 9 12 46 15 42 63 32 5 22 11

42 23 52 48 62 10 24 43 51 37 48

36

Construct grouped frequency distribution for the given data with 6 class intervals.

Number of students in 30 class rooms in a school are given below. Construct a frequency distribution table for the data with a exclusive class interval of 4 (students).

25 30 24 18 21 24 32 34 22 20 22

32 40 28 30 22 26 31 34 15 38 28

20 16 15 20 24 30 25 18

In the following grouped frequency distribution table class marks are given.

(i) Construct class intervals of the data. (Exclusive class intervals)

(ii) Construct less than cumulative frequencies and

(iii) Construct greater than cumulative frequencies.

The marks obtained by 35 students in a test in statistics (out of 50) are as below.

35 1 15 35 45 23 31 40 21 13 15

20 47 48 42 34 43 45 33 37 11 13

27 18 12 37 39 38 16 13 18 5 41

47 43

Construct a frequency distribution table with equal class intervals, one of them being 10-20 (20 is not included).