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Solved Examples
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ff  The total revenue of five companies are represented in the bar graph. What is the difference between the revenue earned by company B and company D?
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ff  The bar graph represents the rainfall in a city from October to December. Find the range of the data.
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ff  A survey conducted by the Educational Department reveals the expenditure on the secondary and high schools. Pick an appropriate bar graph which represents the data shown in the table.
YearSecondary School (in $millions)High School (in $millions)
1985325225
1990361240
1995418274
2000425277
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ff  Customers of a food store were asked to rate the taste of a new health drink as Poor(P), Good(G), or Excellent(E). The data collected is shown here:
GEPGE
GEGPG
EGGGE
PGEGP
EPGEG

Which graph represents the Pareto chart for the given data?   ff
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ff  Which among the Pareto charts represents the frequency of the reasons for late arrival of an employee on a particular year?
Causes for late arrivalNumber of occasions
Family problems8
Woke up late20
Had to take the bus4
Traffic tie - up32
Sick6
Bad weather3
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ff  The pie chart represents the expenditure on different sports by a school authority in a calender year. If the expenditure on Tennis is $880, then what is the expenditure on each sport?  ff View Solution
ff  The orbital velocities of the planets in our solar system are shown in the table. Construct a Pareto chart for the data.
PlanetVelocity (mi/sec)
Mercury29.7
Venus21.8
Earth18.5
Mass15.0
Jupiter8.1
Saturn6.0
Uranus4.2
Neptune3.4
Pluto3.0
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ff  In a survey, the percentage loss of forest cover is as recorded.
RegionPercent
Asia/Pacific76
Europe (Excluding Russia)75
Russia24
Africa68
America35
Represent the data in a Pareto chart.  ff
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ff  The dot plot shows the number of chocolates each student of a class has. How many more chocolates does David have than Joe? Who among the following has median number of chocolates?  ff View Solution
ff  The sales of a local electronic goods store in a particular month is shown in the bar graph. What was the difference between the sales of washing machines and refrigerators in that month?  ff View Solution
ff  Find the decrease in the number of birds from 1997 to 1999 from the bar graph as shown. In which year did the zoo have the least number of birds?
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ff  The bar graph displays the number of people who eat different food items. Find the difference in the number of people who eat Burgers and Deserts. Which of the dot plots represent the data?  ff View Solution
ff  The number of phone calls received by Nathan during each day of the week are in the dot plot. Find the average number of calls Nathan received per day.  ff View Solution
ff  The number of various kinds of snakes found in a zoo are shown in the dot plot. What is the total number of snakes in the zoo?
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ff  The number of children of different age living in a housing complex are shown in the table. Select an appropriate dot plot for the data.
AgeNumber of children
136
148
159
167
174

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ff  Find the mean and mode of the dot plot as shown.  ff View Solution
ff  The number of poems written by students in a competition is shown in the dot plot. What is the fraction of poems written by Tom?
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ff  Construct a pie graph for the points scored by a student in final examination representing the percentage of scores in each subject.
SubjectScore
English82.5
Math105
Science120
French135
History97.5

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ff  The sale of food items in U.S. for the year 2000 is shown in the table.
I. What is the angle made by the sale of bevarages in the pie chart?
II. Find the ratio of the percentage sale of dairy to the sale of produce.
III. What fraction of sales is grain / cereals?
Food itemsSales ($)
Dairy114255.50
Beverages79807.65
Confections76223.75
Meat/Poultry76958.83
Seafood51674.80
Grains/Cereals62039.82
Condiments50491.47
Produce43278.18

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ff  The preferences of a group of 300 students to different soft drinks are detailed in the table.
Soft drinkNumber of Students
Pepsi - Cola92
Diet Coke78
Mt Dew48
7 UP42
Others40
Construct a pie graph for the data representing the central angle for the number of students preferring each soft drink.
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ff  The mode of transport of a group of students to the school is shown in the table.
Mode of transportNumber of students
Walking9
Train10
Tram6
Car12
Bicycle3
What fraction of the students travel by train? Find the ratio of the percentage of the students traveling by bicycle to the students walking to the school.  ff
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ff  The sales of a fruit vendor is shown in the table. Construct a pie chart.
TypesNumber of SalesPercent
Apples12012%
Strawberry30030%
Orange16016%
Mangoes20020%
Others22022%
What is the difference between the sales percent of mangoes and apples?
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ff  Calculate the percentage raise in the number of vehicle registrations from 1990 to 2000 from the graph.  ff View Solution
ff  The manager of ABC company investigated the reasons for the delay associated with processing 67 credit card applications. Pareto chart for the data is shown. Find the total percentage of customers who have not signed on the applications and who have not given their addresses.  ff View Solution
ff  The pie chart represents the expenditure of a family on different items. Answer the following questions by analyzing the pie chart.
I. Find the percentage expenditure on Fuel.
II. What fraction of expenditure is spent on Housing?
III. Find the percentage difference in the expenditure of Clothing and Others.  ff
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