SChand Composite Mathematics Class 7 Chapter 15 Data Handling Exercise 15D

 Exercise 15 D

Question 1

During the festive season, the sales of the various gadgets is as under : 

$\begin{array}{|c|c|c|c|c|}\hline \text { Mixer } & \text { Microwave } & \text { Toaster } & \text { DVD Player } & \text { I Pod} \\\hline 250 & 180 & 200 & 260 & 50 \\\hline\end{array}$

Represent the above information by a bar graph.

(Diagram to be added)

Question 2

The marks obtained by a student in different subjects are:

$\begin{array}{|c|c|c|c|c|c|}\hline \text { Subject } & \text { English } & \text { Maths } & \text { Science } & \text { Hindi }&\text { Social Science } \\\hline \text { Marks } & 70 & 95 & 80 & 60 & 75 \\\hline\end{array}$

(Diagram to be added)

Question 3

The approximate population (in lac) based on 2011 census of 8 Indian States:

$\begin{array}{|c|c|}\hline \text { State } & \text { Population (in lac) } \\\hline \text { Andhra Pradesh } & 850 \\\hline \text { Bihar } & 1050 \\\hline \text { Chhatisgarh } & 260 \\\hline \text { Gujarat } & 600 \\\hline \text { Madhya Pradesh } & 730 \\\hline \text { Maharashtra } & 1130 \\\hline \text { Uttar Pradesh } & 2000 \\\hline \text { West Bengal } & 920 \\\hline\end{array}$

(Diagram to be added)

Question  4

Use the bar graph below to answer the question.

(Diagram to be added)

1. How many students scored above 75 ?

(ii) What score was made by the most students ?

(iii) If the pass score was 70 , how many did not pass ?

(iv) Form a frequency table with the help of the graph and find the mean score.

(Diagram to be added)

Question  5

The marks in a spelling test are shown in this table.

(a) Draw a bar graph to represent this set of data.

(b) What mark did most pupils score ?

(c) How many pupils scored 7 or more?

$\begin{array}{|c|c|c|c|c|c|c|c|}\hline 10 & 6 & 7 & 9 & 5 & 7 & 9 & 3 \\\hline 3 & 9 & 8 & 7 & 6 & 10 & 7 & 6 \\\hline 9 & 5 & 10 & 3 & 8 & 8 & 5 & 9 \\\hline 7  & 8 & 6 & 5 & 9 & 6 & 7 & 5 \\\hline 4 . & 9 & 8 & 7 & 6 & 8 & 10 & 7 \\\hline\end{array}$

(Diagram to be added)

Question  6

$\begin{aligned}&\text { Draw a double bar graph for the given information : }\\&\begin{array}{|l|c|c|c|c|c|c|}\hline \text { Month , } & \text { Jan. } & \text { Feb. } & \text { March } & \text { April } & \text {May } & \text { June } \\\hline \text { Actual Rainfall } & 3 \mathrm{~cm} & 5 \mathrm{~cm} & 6 \mathrm{~cm} & 7\mathrm{~cm} & 8 \mathrm{~cm} & 6 \mathrm{~cm} \\\text { Predicted Rainfall } & 2 \mathrm{~cm} & 3 \mathrm{~cm} & 3 \mathrm{~cm} & 6\mathrm{~cm} & 10 \mathrm{~cm} & 9 \mathrm{~cm} \\\hline\end{array}\end{aligned}$

(Diagram to be added)

Question  7

The table shows Arun and Sanjay's test scores. The tests were marked out of 20 .

$\begin{array}{|l|c|c|c|c|c|c|c|}\hline & \text { English } & \text { Maths } & \text { Science } & \text { History } & \text {Geography } & \text { Hindi } & \text { Art } \\\hline \text { Arun } & 20 & 7 & 12 & 14 & 16 & 18 & 11 \\\text { Sanjay } & 17 & 13 & 18 & 9 & 19 & 10 & 8 \\\hline\end{array}$

(a) Draw a dual bar chart to compare their results.

(b) If anyone scored less than 10 theN had to do the test again. Which tests did (i) Sanjay (ii) Arun have to do again ?

(Diagram to be added)

Question  8

Draw a double-bar graph to compare the data in the given table :

Enrollment in Computer Courses

$\begin{aligned}&\begin{array}{|l|c|c|c|c|}\hline \text { Year/Course } & \text { Basic } & \text { Logo } & \begin{array}{c}\text { Computer } \\\text { Science }\end{array} & \begin{array}{c}\text { Using } \\\text { Software }\end{array} \\\hline \text { Year One } & 130 & 40 & 10 & 20 \\\text { Year Two } & 260 r & 110 & 30 & 90 \\\hline\end{array}\\&\text { Which scale will you prefer to use ? }\end{aligned}$

(Diagram to be added)

Question  9

The performance of a student in 1st term and 2 nd term is given. Draw a double bar graph choosing appropriate scale and answer the following :

$\begin{array}{|l|c|c|c|c|c|}\hline \text { Subject } & \text { English } & \text { Hindi } & \text { Maths } & \text { Science } &\text { S. Science } \\\hline \text { Ist term (M.M. 100) } & 67 & 72 & 88 & 81 & 73 \\\text { 2nd term (M.M. 100) } & 70^{\circ} & 65 & 95 & 85 & 75 \\\hline\end{array}$

(a) In which subject has the child improved his Performance  the most, ?

(b) In which subject is the improvement the least?

(c) Has the performance gone down in any subject

(Diagram to be added)

Question  9

The following graph shows the points scored in five games of basketball. Study the graphs and answer the questions that follow.

(i) How many games did our team win ?

(ii) What is the highest score ? Who scored and in which game ?

(iii) By how many points did our team win the third game ?

(iv) What is the opponent's team highest score ?

(Diagram to be added)