1. (a) Explain how tables, graphs and charts help in the effective presentation of data.

(b) What are the common methods for grouping and presentation of data?

(c) Explain the need and usefulness of diagrammatic representation of statistical data. What are the different types of diagram you know?          ·

2. (a) Mention the advantages ofgraphic presentation of statistical data.

(b) What are the general rules for graphing the data?

3. As per Railway Budget how railways spend each rupee is given below. Draw a pie chart to represent the data. "Every one rupee the Railways spend, a hefty 3 paise is accounted for by staff wages and other allowances. 16 praise for depreciation reserve fund, 13 praise each for fuel and miscellaneous, 7 paise for dividend, 8 paise for stores  and 23 paise for development works".

4. The following table gives the average month ly earnings of the mill workers in a certain city:

Momhly earnings        No. of worken     Monthly  earnings (Rs).   No. of worken

800-850                           21                   1200-1250                       36

850-900                           29                   1250-1300                       45

900-950                           19                   1300-1350                       27

950-1000                         39                   1350-1400                       48

1000-1050                       43                   1400-1550                       21

1050-1100                       94                   1450-1500                       12

1100-1 150                      73                   1500- 1550                      9

1150-1200

(i) Draw ogives by less than and more than methods for the data given below.

(ii) Find the number of workers whose wages lie between Rs. 1.180 and Rs. 1.480.