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Presentation of Data
Draw histogram with the help of the data given below and determine mode.
|
Daily Wages (in Rs.) |
No. of Wage earners |
|
45 – 49 |
2 |
|
50 – 54 |
3 |
|
55 – 59 |
5 |
|
60 – 64 |
3 |
|
65 – 69 |
6 |
|
70 – 74 |
7 |
|
75 – 79 |
12 |
|
80 – 84 |
17 |
|
85 – 89 |
9 |
|
90 – 94 |
7 |
|
95–99 |
6 |
|
100 – 104 |
4 |
|
105 – 109 |
2 |
|
110 – 114 |
3 |
|
115 – 119 |
3 |
Before making the histogram, we have to convert the class intervals :
|
Daily Wages |
No. of Wage |
|
(in Rs.) |
earners |
|
44.5 – 49.5 |
2 |
|
49.5 – 54.5 |
3 |
|
54.5 – 59.5 |
5 |
|
59.5 – 64.5 |
3 |
|
64.5 – 69.5 |
6 |
|
69.5 – 74.5 |
7 |
|
74.5 – 79.5 |
12 |
|
79.5 – 84.5 |
17 |
|
84.5 – 89.5 |
9 |
|
89.5–94.5 |
7 |
|
94.5 – 99.5 |
6 |
|
99.5 – 104.5 |
4 |
|
Daily Wages (in Rs.) |
No. of Wage earners |
|
104.5 – 109.5 |
2 |
|
109.5 – 114.5 |
3 |
|
114.5 – 119.5 |
3 |
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Data represented through arithmetic line graph help in understanding:
Width of bars in a bar diagram need not be equal.
Width of rectangles in a histogram should essentially be equal.
Histogram can only be formed with continuous classification of data.
Histogram and column diagram are the same method of presentaton of data.
Mode of a frequency distribution can be known graphically with the help of histogram.
Median of a frequency distribution cannot be known from the ogives.
What kind of diagrams are more effective in representing the following:
(i) Monthly rainfall in a year.
(ii) Composition of the population of Delhi by religion.
(iii) Components of cost in a factory.
Suppose you want to emphasise the increase in the share of urban non-workers and lower level of urbanisation in India as shown in Example 4.2. How would you do it in the tabular form?
How does the procedure of drawing a histogram differ when class intervals are unequal in comparison to equal class intervals in a frequency table?
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