NCERT Class 8 Mathematics Chapter 5 Data Handling CBSE Board Sample Problems

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Data Handling

Data Handling
Data handling

Sr. no

Term

Description

2

Data

A systematic record of facts or different values of a quantity is called data.

Data mostly available to us in an unorganized form is called raw data.

3

Features of data

  • Arranging data in an order to study their salient features is called presentation of data.

  • Frequency gives the number of times that a particular entry occurs

  • Table that shows the frequency of different values in the given data is called a frequency distribution table

  • A table that shows the frequency of groups of values in the given data is called a grouped frequency distribution table

  • The groupings used to group the values in given data are called classes or class intervals. The number of values that each class contains is called the class size or class width. The lower value in a class is called the lower class limit. The higher value in a class is called the upper class limit. The common observation will belong to the higher class.

4

Bar graph

A bar graph is a pictorial representation of data in which rectangular bars of uniform width are drawn with equal spacing between them on one axis, usually the x axis. The value of the variable is shown on the other axis that is the y axis.

A bar graph is a pictorial representation of data

A Bar Graph is a Pictorial Representation of Data

5

Histogram

Grouped data can be presented using histogram. Histogram is a type of bar diagram, where the class intervals are shown on the horizontal axis and the heights of the bars show the frequency of the class interval. Also, there is no gap between the bars as there is no gap between the class intervals.

Grouped data can be presented using histogram

Grouped Data Can be Presented Using Histogram

6

Circle Graph or pie-chart

A circle graph shows the relationship between a whole and its part

Circle Graph or pie-chart

Circle Graph or Pie-Chart

Change or Probability

Change or Probability
Change or Probability

Sr. no

Term

Description

1.

Random experiment

A random experiment in one whose outcome cannot be predicted exactly in advance

2.

Equally Likely outcome

Outcomes of an experiment are equally likely if each has the same chance of occurring

3.

Event

One or more outcomes of an experiment make an event.

4.

Probability

Probability of an event

This is applicable when the all outcomes are equally likely

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