# RS Aggarwal Solutions for Class 8 Chapter 21 - Data Handling Exercise 21B

BYJU’S expert team have solved the RS Aggarwal Solutions to ensure that the students are thorough with their basic concepts by practising the solutions. Students can refer and download RS Aggarwal Solutions for Class 8 Maths Chapter 21- Exercise 21B, Data Handling from the links provided below.

In Exercise 21B of RS Aggarwal Class 8 Maths, we study about the grouping of data, presentation of data in groups along with the frequency of each group, which is known as the frequency distribution of the grouped data.

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### Access Answers to RS Aggarwal Solutions for Class 8 Maths Chapter 21- Data Handling Exercise 21B

1.The marks obtained by 40 students of a class in an examination are given below:
8, 47, 22, 31, 17, 13, 38, 26, 3, 34, 29, 11, 22, 7, 15, 24, 38, 31, 21, 35, 42, 24, 45, 23, 21, 27, 29, 49, 25, 48, 21, 15, 18, 27, 19, 45, 14, 34, 37, 34.
Prepare a frequency distribution table with equal class intervals, starting from 0-10 (where 10 is not included).

Solution:

The frequency distribution table is given below

 Marks Tally marks Number of Students(Frequency) 0-10 III 3 10-20 $\large&space;\bcancel{IIII}&space;III$ 8 20-30 $\large&space;\bcancel{IIII}$$\large&space;\bcancel{IIII}IIII$ 14 30-40 $\large&space;\bcancel{IIII}IIII$ 9 40-50 $\large&space;\bcancel{IIII}I$ 6 TOTAL 40

2. The electricity bills (in rupees) of 25 houses of a certain locality for a month are given below:
324, 700, 617, 400, 356, 365, 435, 506, 548, 736, 780, 378, 570, 685, 312, 630, 584, 674, 754, 776, 596, 745, 565, 763, 472.
Arrange the above data in increasing order and form a frequency table using equal class intervals, starting from 300-400, where 400 is not included.

Solution:

The frequency distribution table is given below

 Electricity bills Tally marks Number of houses(Frequency) 300-400 $\large&space;\bcancel{IIII}$ 5 400-500 III 3 500-600 $\large&space;\bcancel{IIII}I$ 6 600-700 IIII 4 700-800 $\large&space;\bcancel{IIII}II$ 7 TOTAL 25

3. The weekly wages (in rupees) of 28 workers of a factory are given below:
668, 610, 642, 658, 668, 620, 719, 720, 700, 690, 710, 642, 672, 654, 692, 706, 718, 702, 704, 678, 615, 640, 680, 716, 705, 615, 636, 656.
Construct a frequency table with equal class intervals, taking the first of the class intervals as 610-630, where 630 is not included.

Solution:

The frequency distribution table is given below

 Weekly Wages Tally marks Number of Workers(Frequency) 610-630 IIII 4 630-650 IIII 4 650-670 $\large&space;\bcancel{IIII}$ 5 670-690 III 3 690-710 $\large&space;\bcancel{IIII}II$ 7 710-730 $\large&space;\bcancel{IIII}$ 5 TOTAL 30

## RS Aggarwal Solutions for Class 8 Maths Chapter 21- Exercise 21B

Exercise 21B of RS Aggarwal Class 8, Data Handling. This exercise mainly consists of questions related to the Grouping of Data using frequency distribution table.

The RS Aggarwal Solutions can help the students practice diligently while learning the fundamentals as it provides all the answers to the questions from the RS Aggarwal textbook. Students are suggested to practice the problems regularly will help them excel in their exams and increase their overall percentage. Practising as many times as possible helps in acquiring time management skills and also boosts the confidence level to achieve high marks.