ICSE Solutions for Chapter 23 Graphical Representation Class 10 Mathematics

Question 1: Draw histogram for the following distributions:

Solution 1:

(i)

Steps of construction:

(a) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

(b) Construct rectangles with class intervals as bases and corresponding frequencies as heights.

(ii)

Steps of construction:

(a) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

(b) Construct rectangles with class intervals as bases and corresponding frequencies as heights.

Steps of construction:

(a) Convert the class marks into class intervals.

(b) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

(iv)

Steps of construction:

(a) Convert the class marks into class intervals.

(b) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

Question 2: Draw cumulative frequency curve (ogive) for each of the following distributions:

Solution 2:

(i)

Steps of construction:

(a) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

(b) Construct rectangles with class intervals as bases and corresponding frequencies as heights.

(ii)

Steps of construction:

(a) Convert the data into exclusive form.

(b) Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.

(d) Join the mid-points of the rectangle to obtain the ogive.

Question 3: Draw an ogive for each of the following distributions:

Solution 3:

Steps Of construction:

(a) Plot the points (10, 8), (20, 25), (30, 38), (40, 50) and (50, 67) on the graph.

(b) Join them with free hand to obtain an ogive.

(ii)

Steps Of construction:

(a) Plot the points (10, 0), (20, 17), (30, 32), (40, 37), (50, 53) and (70, 65) on the graph.

(b) Join them with free hand to obtain an ogive.

Question 4: Construct a frequency distribution table for the number given below, using the class intervals 21 - 30, 31 - 40...... etc.

75, 67, 57, 50, 26, 33, 44, 58, 67, 75, 78, 43, 41, 31, 21, 32, 40, 62, 54, 69, 48, 47, 51, 38, 39, 43, 61, 63, 68, 53, 56, 49, 59, 37, 40, 68, 23, 28, 36, 47

Use the table obtained to draw:

(i) a histogram (ii) an ogive

Solution 4:

(i)

(ii)

Plot the points (30, 4), (40, 13), (50, 22), (60, 29), (70, 37), (80, 40) on the graph and join them with free hand to obtain an ogive.

Question 5:

(a) Use Information given in the adjoining histogram to construct a frequency table.

(b) Use this table to construct an ogive.

Solution 5:

(b) Now plot the points (12, 9), (16, 25), (20, 47), (24, 65), (28,77), (32, 81) and join them to obtain an ogive.

Question 6:

(a) From the distribution, given above, construct a frequency table.

(b) Use the table obtained in part (a) to draw; (i) a histogram, (ii) an ogive.

Solution 6:

(a) Difference in consecutive class marks = 17.5 - 12.5 = 5

First class interval will be 10 - 15 and so on.

Total = 145

(b) Now plot the points (15, 12), (20, 29), (25, 51), (30, 78), (35, 108), (40, 129), (45, 145) and join them to obtain an ogive.

Question 7:

Use graph paper for this question.

The table given below shows the monthly wages of some factory workers.

(i) Using the table, calculate the cumulative frequencies of workers.

(ii) Draw a cumulative frequency curve.

Use 2 cm = Rs 500, starting the origin at Rs 6500 on x-axis, and 2em = IO workers on the y-axis.

Solution 7:

Total = 110

Now plot the points (7000, 10), (7500, 28), (8000, 50), (9000, 92) and (10000, 110) and join them to obtain an ogive.

Question 8: The following table shows the distribution of the heights of a group of factory workers:

(i) Determine the cumulative frequencies.

(ii) Draw the 'less than' cumulative frequency curve on graph paper. Use 2 cm = 5 cm height on one axis and 2 cm = 10 workers on the other.

Solution 8:

We plot the points (155, 6), (160, 18), (165, 36), (170, 56), (175, 69), (180, 77) and (185, 83) on the graph and join them in free hand to obtain an ogive.