Write the class mark of the class 130-150.

The number of books in different shelves of a library are as follows:

30, 32, 28, 24, 20, 25, 38, 37, 40, 45, 16, 20

19, 24, 27, 30, 32, 34, 35, 42, 27, 28, 19, 34

38, 39, 42, 29, 24, 27, 22, 29, 31, 19, 27, 25

28, 23, 24, 32, 34, 18, 27, 25, 37, 31, 24, 23,

43, 32, 28, 31, 24, 23, 26, 36, 32, 29, 28, 21

Prepare a cumulative frequency distribution table using 45-49 as the last class0interval.

The monthly pocket money of six friends is given below:

Rs. 45, Rs. 30, Rs. 40, Rs. 50, Rs. 25, Rs. 45

(i) What is the highest pocket money?

(ii) What is the lowest pocket money?

(iii) What the range?

(iv) Arrange the amounts of pocket money in ascending order.

The mid-value of a class interval is 42. If the class size is 10, then the upper and lower limits of the class are:

The difference between the upper and the lower class limits is called

Explain the difference between a frequency distribution and a cumulative frequency distribution.

In a frequency distribution, gives are graphical representations of

The difference between the highest and lowest values of the observations is called