chapter 8- data handling terms related to it, types of graphs i.e bar graph, histogram , double bar graph and graphs interpretation with examples. tally marks and frequency distributions and related questions to it

1. DATA - HANDLING
By Ms Geetanjali
youtube channel-
Geetanjali Adhikari
https://www.youtube.co
m/watch?v=g5JTMQEg

2.  Statistics is the branch of science which deals
with the collection, classification , tabulation
and interpretation of numerical data

3.  Collection of Raw facts and figures is called
data.
 i.e 2,4,56,anil, amul, 78, etc
 Each numerical facts of this type is known as
an observation/numerical data.

5.  Pictograph
 Bar graph
 Double bar graph
 Pie chart
 Histogram
 polygon

6. PICTOGRAPH
(i) 250
(ii) SEPTEMBER
400

8. ANS: (i) No. of students in each year in class 8th
(II) 2003-2004
(III)2007-2008
(IV) yes

9. ANS: (i) marks obtained by students in maths and science
(ii)maths
(iii)english

10.  Frequency of an observation:
The number of times a particular observation
occurs in a given data is called its frequency.
i.E 4,4,5,5,5,5,7,8,7,7,7
Number 4- 2times
Number 5 -3 times
Number 7 - 4 times
Number 8- 1 times
Frequency

11.  Data which gather from the experiment or
study.
 Here, the data is raw it is not sorted in
categories.
 An ungrouped data basically a no’s.
 Example: score of batsman in 5 matches
45,34,2,77and 80

12. Q 1: The number of members in 20 families are given below:
4,6,5,5,4,6,3,5,3,5,4,3,5,4,6,7,3,5,7,5.
a) Prepare a frequency distribution table.
b) How many families has less than five members?

13.  It is the type of raw data categorised into
various groups.
 Here, the data is large.
FREQUENCY DISTRIBUTION
 Presentation of data in groups along with the
frequency of each group is known as the
frequency distribution of the grouped data

14. Q: The marks obtained by 40 students of class VIII in an examination are given below :
16, 17, 18, 3, 7, 23, 18, 13, 10, 21, 7, 1, 13, 21, 13, 15, 19, 24, 16, 3, 23, 5, 12, 18, 8, 12, 6, 8, 16, 5, 3, 5,
0, 7, 9, 12, 20, 10, 2, 23.
Divide the data into five groups namely 0-5, 5-10, 10-15, 15-20 and 20-25 and prepare a grouped
frequency table.
MARKS TALLY MARKS FREQUENCY
0-5 |||| | 6
5-10 |||| |||| 10
10-15 |||| || 8
15-20 |||| |||| 9
20-25 |||| | 7
TOTAL 40