Histograms

From the histogram given on the right, we can say that 1500 males above the age of 20 are literate.

The weekly wages (in Rs.) of 30 workers in a factory are given:
830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840
Mark a frequency table with intervals as 800-810, 810-820 and so on, using tally marks. Also, draw a histogram and answer the following questions:
(i) Which group has the maximum number of workers?
(ii) How many workers earn Rs 850 and more?
(iii) How many workers earn less than Rs 850?

The total area of the histogram is _________ to the total frequency of the given data

The below histogram shows the number of literate females in the age group of 10 to 40 years in a town.

1. Write the classes assuming all the classes are of equal width.
2. What is the classes width?
3. In which age group are literate females the least?
4. In which age group is the number of literate females the highest?

For which of these would you use a histogram to show the data?

(a) The number of letters for different areas in a postman’s bag.

(b) The height of competitors in an athletics meet.

(c) The number of cassettes produced by 5 companies.

(d) The number of passengers boarding trains from 7:00 a.m. to 7:00 p.m. at a station.

Give reasons for each.

Construct a frequency polygon without using a histogram for the following frequency distribution :

Draw a histogram for the following data.

Draw the Histogram and hence, the frequency polygon for the following frequency distribution: