S.chand books class 8 maths solution chapter 29 Graphical Representation of Data exercise 29 A

 EXERCISE 29 A

Question 1

The following table shows the number of students in a school playing five different games.

Games	Football	Hockey	Cricket	Tennis	Squash
Number of students	200	175	250	75	50

Present this information on a bar graph

Sol :

Question 2

The following table shows how a student spends his pocket money during the course of a month

Item	Food	Entertainment	Other expenditure	Savings
Expenditure	40%	25%	20%	15%

If the pocket money in 1000 rupees , represent the above information on a table showing expenditure in rupees. Then draw a bar graph showing the expenditure.

Sol :

Question 3

Given alongside is a graph showing the areas(in thousand square miles) of the five Great Lakes . Read the bar graph carefully and answer the questions given below.

(i) How many square miles of area is represented by 1cm block on the vertical axis ?

Sol : 5000 sq miles

(ii) The area of the largest lake is about how many times the area of the smallest lake ? Also , name the smallest and largest lakes.

Sol : Lake Superior is about four times lake Ontario

(iii) How much is Lake Erie larger in area than Lake Ontario ?

Sol : 2500 sq miles

(iv) Between which to lakes in the different in area the least ?

Sol : Lake Michigan and Lake Huran

Question 4

This double column graph compares the average number of hours an electrical appliance is used on weekdays and weekends.
Read the graph and answer the following questions.

(i) Which appliance has got the maximum usage ?

Sol : Refigerator

(ii) Which appliance is used twice as many hours on the weekend as it is used on weekdays ?

Sol : Computer

(iii) What is the average number of hours an AC is used on weekend ?

Sol : 16 hours

(iv) Which appliances are each used for 6 more hours on a day on weekends than on a weekdays ?

Sol : Lights and AC