CBSE Class 7 Mathematics Data Handling Assignment Set 03

Mathematics Assignment No-06-Data Handling

Question 1. The following table shows the daily production of T.V. in an industry for 7 days of a week.

Represent the above data in the form of Bar chart.
Answer: To represent the given data in a bar chart, take days along the horizontal axis (X-axis) and daily production along the vertical axis (Y-axis). Choose a suitable scale on the Y-axis, such as 1 unit = 50 T.V. units.
In simple words: Draw rectangular bars of uniform width where heights correspond to the T.V. production numbers for each day.

Exam Tip: Always label the X-axis and Y-axis clearly and choose a uniform scale.

Question 2. In the middle school, the ages of all students studying in VI, VII, VIII Standard were recorded as under

Represent the above data in the form of Bar-graph.
Answer: Take age in years along the X-axis and the number of students along the Y-axis. Choose a scale on the Y-axis such as 1 unit = 5 students.
In simple words: Plot student counts against their respective ages using vertical bars.

Exam Tip: Maintain equal spacing between consecutive bars.

Question 3. Marks obtained by 5 students of class VII in half-yearly and final examinations in 2010 in Mathematics (out of 50) are given below. Represent this data by means of double bar-graph and also answer the given questions.
(a) Do you see any improvement?
(b) Who has not done better?

Answer:
(a) Yes, in the final exam, most students show improvement.
(b) Student D has not done better (marks decreased from 50 to 48).
In simple words: Compare side-by-side bars for each student to track score changes between exams.

Exam Tip: Include a legend specifying which bar color represents the half-yearly exam and which represents the final exam.

Question 4. Draw double bar graph for the following data and ans the questions given below
(a) Which is the hottest and coldest city?
(b) Which city has the maximum difference in day's temp?

Answer:
(a) Hottest city is T (maximum temperature = 35) and coldest city is R (minimum temperature = 6).
(b) City Q has the maximum difference in day's temperature (\(25 - 16 = 9\)).
In simple words: Analyze the maximum and minimum temperature values across all cities to find extremes and differences.

Exam Tip: Compute differences for each city carefully before concluding the maximum.

Question 5. Read the bar-graph given below and answer the following questions:
(a) What is the information given by the bar graph?
(b) In which subject, the child is poor?
(c) What are the average marks obtained by him?
(d) Is there any subject in which he is equally good?
Answer:
(a) The graph shows the marks obtained by a student in an examination across different subjects (English, Hindi, Maths, Social Studies, Science, Sanskrit).
(b) Sanskrit (lowest marks, approximately 30%).
(c) Average marks = \(\frac{80 + 70 + 90 + 60 + 100 + 30}{6} = \frac{430}{6} \approx 71.67\% \approx 72\%\).
(d) No.
In simple words: Read individual bar heights from the graph, sum them up, and divide by the total number of subjects to get the average.