AP State Syllabus AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 Textbook Questions and Answers.

AP State Syllabus 8th Class Maths Solutions 7th Lesson Frequency Distribution Tables and Graphs Exercise 7.3

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3

Question 1.
The following table gives the distribution of45 students across the different levels of intelligent Quotient. Draw the histogram for the data.
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 1
Solution:
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 2
Steps of construction:
1. Calculate the difference between mid values of two consecutive classes
∴ h = 75 – 65 = 10
∴ Class interval (C.I) = 10

2. Select such a right scale
on X-axis 1 cm = 10 units
on Y-axis 1 cm 1 student

3. Construct a histogram with C.Is as width and frequencies as lengths.

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3

Question 2.
Construct a histogram for the marks obtained by 600 students in the VII class annual
examinations.
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 3

Solution:
Classes will be prepared on class marks.
Step – 1: Take the difference between the mid values of two consecutive classes.
∴ h = 400 – 360 = 40

Step – 2: Let the lower and upper boundaries be taken as x – \(\frac{h}{2}\) , x + \(\frac{h}{2}\)
∴ x – \(\frac{h}{2}\) = 360 – \(\frac{40}{2}\) = 360 – 20 = 340
x + \(\frac{h}{2}\) = 360 + \(\frac{40}{2}\) = 360 + 20 = 380

Step – 3 : Select the scale
on X-axis 1 cm = 1 C.I (mid values)
on Y-axis 1 cm = 20 students

Step – 4 : Take C.I’s as width, frequencies as lengths.
Then construct the histogram.

Class Marks Class Interval Frequency
360 340- 380 100
400 380- 420 125
440 420-460 140
480 460-500 95
520 500-540 80
560 540-580 60

Scale : On Y – axis no. of students = 20, On X – axis take marks of students.
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 4

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3

Question 3.
Weekly wages of 250 workers in a factory are given in the following table. Construct the histogram and frequency polygon on the same graph for the data given.
using the histogram. (Use separate graph sheets)
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 5
Solution:

Class Interval
(Weekly wages)
Frequency
(No. of workers)
Mid values
500-550 30 525
550-600 42 575
600-650 50 625
650-700 55 675
700-750 45 725
750 -800 28 775
N = 250

Steps of constructIon:

  1. C.I. = Difference of two consecutive mid values = h = 575 – 525 = 50
  2. Scale : On X-axis 1 cm = ₹ 50
    On Y-axis 1 cm = lo members
  3. Take on X-axis width of C.I, on Y-axis frequncies.
  4. Keep points A, B, C, D, E, F, G, H on the mid points of rectangles.
  5. The area of a histogram is equal to the area of a polygon.

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 6

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3

Question 4.
Ages of 60 teachers in primary schools of a Mandai are given in the following frequency distribution table. Construct the Frequency polygon and frequency curve for the data without using the histogram. (Use separate graph sheets)
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 7
Solution:
Construction of frequency polygon:

  1. Class interval = The difference between two mid values of classes
    = 30 – 26 = 4
  2. Scale : On X-axis take the age of teachers
    On Y-axis take number of teachers.
  3. Scale: On X-axis 1 cm = 4units
    On Y- axis 1 cm = 2 units
  4. Take the widths of classes on X – axis. Frequencies on Y – axis.
  5. The points are formed on the graph sheet are joined by a scale then the required frequency polygon and if the points are joined by hand frequency curve will be formed.

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 8

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3

Question 5.
Construct class intervals and frequencies for the foliowing distribution tabie. Also draw the ogive curves for the same.
AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 9
Solution:
Steps of constructIon:
Step – 1: If the given frequency distribution is in inclusive form, then convert it into an
exclusive form.

Step – 2: Calculate the less than cumulative frequency.

Step – 3: Mark the upper boundaries of the class intervals along X-axis and their corresponding cumulative frequencies along Y-axis.

Select the scale:
X – axis 1 cm = 1 class interval
Y – axis 1 cm = 10 students

Step – 4: Also, plot the lower boundary of the first class (upper boundary of the class previous to first class) interval with cumulative frequency 0.

Step – 5: Join these points by a free hand curve to obtain the required ogive.
Similarly we can construct ‘greater than cumulative frequency curve by taking greater than cumulative on Y – axis and corresponding ‘lower boundaries’ on the
X-axis.

AP Board 8th Class Maths Solutions Chapter 7 Frequency Distribution Tables and Graphs Ex 7.3 10