Page 263 - ICSE Math 8

3. In the month of October 2009, a house holder spent his monthly salary amounting to ` 7,200 on different
items as given below.

Items Clothing Food House rent Education Miscellaneous

Amount spent (in `) 600 4,000 1,200 400 1,000

Represent the information in the form of a pie chart.

4. The pie chart given in the figure shows how Arushi spends her pocket money.
Read the pie chart and answer the following questions: School
(a) How does Arushi spend the largest amount of her pocket money? canteen Toys and
games
(b) What fraction of her pocket money does she save?
Books and
(c) What percentage of her money is spent on books and stationery? stationery Savings
(d) If her total pocket money was ` 360, find the ratio of her expenditure
to the savings.
5. Observe the pie chart given in the figure. It shows the market share of four
companies S, T, U and V. Now answer the following questions:
S
(a) If the market share of company S is ` 8 crores, what is the market share V 80º
of company T? 120º
60º
(b) Which company has the maximum market share? 100º T
(c) If the total market is worth ` 72 crores, what is the share of company U? U

AT A GLANCE

¾ The number of times an observation occurs in the given data is called the frequency of the
observation.

¾ Range = Greatest value – Smallest value
¾ Class size = Difference between two successive lower class limits or two successive upper class limits
Upperlimit +Lower limit
¾ Class-mark =
2
Ê hˆ Ê hˆ
¾ If a – b is an inclusive class interval, then its exclusive class interval becomes a - ˜ - Á Ë b + ˜ ¯ 2 ,
Á
Ë
¯ 2
where h = Lower limit of a class – Upper limit of previous class
¾ A bar graph is a pictorial representation of numerical data in the form of rectangles of equal width and
varying heights.
Value of component °
¾ In a pie chart, the central angle for a sector (or a component) = × 360
Total value of all components

Central angle of the component Total value of all the co× m mponents
Value of a component = 
360
Central angle of the component 100×
Percentage value of a component = 
360

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