Data Handling

 Mind Maps

Class V - maths: Data handling
Q) Which is used to represent numerical data by a number of rectangular bars of equal width?

Q) Which graphs are used to represent part of a whole relationship?

Q) Which chart is a quick and easy way to count how many are there in each category?

Q) The number of times a particular observation occurs in the data is known as what?

Q) What is the information in the form of figures, which is used to find out things and to make decisions?

Q) Represent the number 4 in tally marks?

Q) Bar graphs can only be a?

Q) If in a pictograph, * * represents 4 books, what does * * * * represent?

Q) Circle graphs are also known as?

Q) Data is the information in the form of figures, which is used to find out things and to make decisions is called?

Q) Explain about the Bar Graphs?

Q) Explain about the Circle Graphs?

Q) Which is the most favourite pizza toppings as per the graph?

Q) Which is the least favourite pizza toppings as per the graph?

Q) What is data handling?

Q) What is bar graph and tally chart?

Q) In Class V how many students are there as per the image?

Q) In which classes same number of students are present as per the image?

Q) How many customers in the month of March as per the graph?

Q) What is the difference between the number of customers in March and the May as per the graph?

Q) In which month number of customers are 200 as per the graph?

Q) What is tally chart and give an example?

Q) What is data handling and give an example?

Q) What is bar graph and give an example?

Q) What is circle graph and give an example?

Q) What is bar graph and tally chart? Give an examples?

DATA HANDLING

### Data

Definition

"Data is the information in the form of figures, which is used to find out things and to make decisions".

The collection of data is done keeping in mind the specific information needed from the data.

Before collecting data, we need to know what we would use it for.

Example:

If we need to find the runs scored by a cricket player during a tournament,
we first need to find the number of matches played by him in that particular tournament.

Data Handling is very useful in drawing conclusions as we can compare and contrast information present on different kinds of graphs

TALLY CHART

"A tally chart is a quick and easy way to count how many are there in each category.

We represent each item as vertical stroke '|’

and every fifth observation is represented by crossing the four strokes diagonally ' ||||'.

FREQUENCY

"The number of times a particular observation occurs in the data is known as frequency".

Example:

If an observation occurs 7 times in a data, its frequency is 7.

• Joseph takes a survey among his classmates to find out their favourite sport, among the following sports:
• Basketball, Ice Hockey, Baseball, Soccer.
He records the choice of each student by using tally marks.

Solution:

Form the above tally chart we can conclude that

• 5 students like Ice Hockey
• 4 students like Baseball
• 2 students like Soccer.
• The most popular sport among the students is Basketball
• The least favourite spot is the Soccer.

Representing the above information using a pictograph:

BAR GRAPHS

"A bar graph is used to represent numerical data by a number of rectangular bars of equal width".

The length of a bar graph represents the frequency.

Bar graphs can be vertical or horizontal.

It is one of the most common and effective way of representing a data.

Every bar graph must have the following features.

• Title of the bar graph
• The horizontal and vertical scales used
• The labelling of the scales

Let us have a look at the following bar graph.

The bar graph shown above represents the number of customers per month from January to May.

The months have been shown along the horizontal axis and the number of customers on the vertical axis.

The scales used are:

Horizontal Scale:

1 square = 1 month

Vertical Scale:

1 square = 100 customers.

From the bar chart we can conclude that:

• Total number of customers from January to May = 1500.
• The month which has maximum customers = March
• The month which has minimum customers = May
CIRCLE GRAPHS

"Circle graphs are used to represent part of a whole relationship.

They are used to compare different parts of a whole amount".

They are also called as pie charts.

• They are circular shaped graphs with the entire circle representing the whole.
• The circle is then split into parts or sections.
• Each part or section is proportional in size to the amount each part or portion represents.

Therefore, it is easy to make comparisons.

Example:

The table below shows the preference of 48 guests at a party in selecting the flavours of ice creams.

Represent the same information on a circular graph.

LITCHI SUNDAE:6 out of 48

= 1/8 of the total

i.e., 1/8 of the circle is marked Litchi Sundae.

MANGO DELIGHT:24 out of 48

= 1/2 of the total

i.e., 1/2 of the circle is marked Mango Delight.

DRYFRUIT MIX:12 out of 48

= 1/4 of the total

i.e., 1/4 of the circle is marked Dry fruit Mix.

KULFI:6 out of 48

= 1/8 of the total

i.e., 1/8 of the circle is marked Kulfi.

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