2. • Data : Data is the collection of informations collected for definite
purpose .
• Ex: Collection of marks of students of class 7out of 40 in
Mathematics.
• Heights of students of class 7.
• Weights of students f class 7
3. WHAT IS DATA
HANDLING?
• Data handling is the way in
which Data can be
represented graphically to
give a clear idea of what it
represents. It is easier to
interpret and organize data
using pictorial
representation.
• Data handling includes bar
graph, pictograph and
tallymarks.
4. WHAT IS A BAR
GRAPH?
• It is the way of representing
data visually. Bars are of
uniform width and can be
drawn horizontally or
vertically with equal spacing
between them. The length
of each bar represents the
given number frequency.
5. WHAT IS A PIE CHART ?
• These are called circle
graphs. A circle graph shows
the relationship between a
whole and its parts. Here, the
whole circle is divided into
sectors. The size of each
sector is proportional to the
activity or information it
represents.
6. WHAT IS A
PICTOGRAPH?
• The representation of an
information through pictures
is called a pictograph.
Pictographs use relative sizes
or repetitions of the same
icon, picture, or symbol to
show comparison. Also called
pictogram, pictorial chart,
pictorial graph, or picture
graph.
8. TYPES OF BAR GRAPH
Stacked Bar Graph
Double Bar Graph
Horizontal Bar Graph
Vertical Bar Graph
9. RANGE
• Range = Highest value – lowest value
• Range is another representative value of the data. Range is defined
as the difference between the highest and the lowest observation.
11. • Questions for students .
• Find the mean of first 10 whole numbers.
• Find th mean of runs scored by a batsman in 6 innings
• 36,35,50,46,60,65
12. MEDIAN
• Median=Middle of the
data
• Median refers to the
value which lies in the
middle of the data when
data is arranged in an
increasing or decreasing
order.
13. • Formula for finding the median after arranging the data in ascending order.
• When the number of observations are odd then median term is
•
𝑛+1
2
where n is the number of observations.
• Find the median of the following observations
• 6,15,120,50,100,80,10,15,8,10,15
• Ascending order
• 6,8,10,10,15,15,15,50,80,100,120
• Median term is
𝑛+1
2
=
11+1
2
=
12
2
=6
• Hence 6observtion ie15 is median
