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.

Six numbers from a list of nine integers are 7, 8, 3, 5, 9 and 5. Find the largest possible value of the median of all nine numbers in this list.

The median of a set of 9 distinct observations is 20. If each of the largest 4 observations of the set is increased by 2, find the median of the resulting set.

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

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?