Data Handling Class 8 Worksheets

# Data Handling Class 8 Worksheets

## Data Handling Class 8 Worksheets

Maths worksheets play a vital role in strengthening the maths concepts. After studying the concepts of mathematics, revision of questions related to that particular topic is very important for the students. This assesses the preparation of the students. Students can assess themselves by its own by solving the worksheets problems. Parents and teachers can also assess the students by giving them these worksheets to the students to solve.

Maths-formula brings such worksheets on Data Handling Class 8 for you. By solving these worksheets, you can increase the understanding of the concepts learnt. These worksheets are prepared by experienced teachers and subject matter experts.

Thus, let us try to attempt these questions to solve and assess yourself. Parents and teachers can also give these questions to the students to test them. Unit tests can also be prepared by the teachers using these questions.

## Data Handling Class 8 Worksheet 1

1. The daily wages of 40 workers working in a factory are given below. Find the mean of the daily wages.

 Numbers of workers Daily wages (in rupees) 8 160 12 200 10 220 6 280 4 250

2. Construct a frequency distribution table for the electricity bills (in Rs) of 40 houses in a locality using equal class intervals, one of them being 100 – 150.

350, 320, 165, 334, 137, 380, 128, 118, 392, 154, 260, 384, 108, 254, 224, 210, 120, 330, 290, 310, 165, 368, 180, 315, 220, 320, 378, 222, 349, 115, 156, 175, 367, 215, 230, 280, 285, 290, 305, 308

3. The average wage of a worker during a week was Rs 70 per day. During the first 4 days, the average wage was Rs 65 per day and the average wage during the last 4 days was Rs 72 per day. What was his wages on the 4th day?

4. a. Determine the mode of the following marks obtained by 15 students in a class:

49, 42, 35, 38, 37, 49, 48, 37, 42, 43, 37, 42, 37, 43, 45

b. Find the mode of the runs scored by 10 players in a one-day cricket match:

12, 35, 52, 105, 52, 97, 35, 97, 40, 52

5. Find the median of the following:

a. 18, 10, 21, 7, 15, 22, 13

b. 12, 25, 10, 4, 15, 17, 18, 12, 14, 21, 19, 41, 32

c. 31, 21, 13, 19, 27, 18, 8, 15

6. The following table shows the scores of a mathematics test of 40 students in a class.

 Number of students 40−50 50−60 60−70 70−80 80−90 90−100 Test scores 5 6 7 10 9 3

Draw a histogram to represent the above data.

7. The following histogram shows the weight of new born babies in a hospital.

a. How many new born babies are there in the hospital?

b. How many babies weighs below 3 kg?

c. How many babies weighs above 2.5 kg?

8. Calculate the mode of the following distribution.

 Heights (in cm) 65 68 88 110 80 76 54 Numbers of plants 6 5 4 8 13 14 5

9. In a class of 72 students, 40 opted Hindi, 25 opted English and 7 opted French. Depict it by a pie chart.

## Data Handling Class 8 Worksheet 2

1. Read the following table and choose the correct answer from the given alternatives.

 Class interval 0−5 5−10 10−15 15−20 20−25 25−30 Frequency 17 26 18 13 2 7

a. The size of the class 15–20 is

i. 15                 ii. 20                iii. 17.5           iv. 5

b. The lower limit of class 10–15 is

i. 25                 ii. 10                iii. 15               iv. 35

c. The upper limit of the class 25–30 is

i. 30                 ii. 55                iii. 25               iv. 27.5

d. The class mark of the class 5–10 is

i. 5                  ii. 10                  iii. 7.5             iv. 15

2. Form a grouped frequency table of intervals 0–10, 10–20, 20–30 etc., from the following marks out of 50 obtained by a group of students.

6, 28, 33, 20, 42, 28, 38, 33, 31, 30, 49, 48, 50, 33, 28, 19, 10, 14, 13, 19, 38, 43, 30, 31, 26, 38, 39, 50, 50, 49

3. The given bar graph shows the daily earnings of 25 persons.

a. Find the number of persons whose earning is maximum.

b. How many persons are in 80–90 class?

c. What is the minimum earning of a person daily?

4. The area of carpet (in sq. metres) sold to various customers is noted below:

6.5, 7.3, 9.8, 6.3, 15.7, 3.3, 5.8, 11.4, 8.7, 6.4, 15.7, 12.5, 5.3, 9.7, 8.9, 10.2, 12.1, 5.7, 21.5, 9.0, 18, 25.3, 7.6, 14.4, 10.6, 26.7, 8.2, 10, 7.5, 9.8, 13.6

Choose your own class intervals and prepare a frequency distribution table.

5. Given below are the marks of 50 students.

 Class intervals (marks) 0−20 20−40 40−60 60−80 80−100 Numbers of students 2 4 18 14 12

Represent the data by histogram.

6. The heights of 30 students in a class are given as shown:

 Heights (in cm) 120−125 125−130 130−135 135−140 140−145 145−150 150−155 155−160 Numbers of students 2 4 6 2 7 5 2 2

Draw a bar graph to represent the above data.

7. The daily earnings of a group of people are given in the following histogram.

a.     How many people earn Rs 80 to Rs 90 daily?

b.     How many people earn Rs 100 to Rs 120 daily?

c.     How many people are there in the group?

8. A certain amount of water is heated and the temperature after some intervals is noted in the following table:

 Time (in min) 2 5 8 11 Temp. (in °C) 13 19 25 31

Draw time temperature graph and answer the following questions from the graph.

a. Estimate the temperature after 6 minutes.

b. After what time the temperature was 15°C?

9. The following table shows the displacement of a body at different times. Draw a displacement time graph and find out how much will the body be displaced after 4 seconds.

 Time (in sec) 3 5 6 7 Displacements (in sec) 9 17 21 25

10. A survey was made to find the types of music that a certain group of young people liked in a society. The pie chart in the given figure depicts the findings of this survey.

From the pie chart answer the following questions:

a. If 20 people like classical music, how many young people are surveyed? Also find the central angle of each.

b. Which type of music is liked by the maximum number of people?

c. If a company were to make 1000 CDs, how many of each type would they make?

11. Find the median when the following number of attendance during first 14 days of the month in a classroom are noted.

23   24   22   30   25   29   20   28   27   20   19   30   21   26

12. The weight of 40 students is recorded and the result is given below:

 Heights (in kg) 50 55 60 65 70 Number of students 8 7 11 5 9

Find the average weight.

13. The angle of the sector of an outcome in a pie chart is 60°. Find the ratio of the frequency of this outcome to the total frequency.

14. Jyoti’s average score in 4 subjects is 64. When she receives her score in her sixth subject, her average rose to 68. How much does she score in fifth and sixth subject?

15. The number of defects observed in 18 finished goods in a factory are noted as follows:

0   0   1   2   3   5   5   4   4   0   1   4   4   2   3   4   5   1

Find the mode of the observation.

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