2. • Statistics is a study or scientific method of
collecting,organizing,processing,presenting,a
nalyzing,data and drawing a conclusion
according to the result of data analysis.
• Collection of the data is the beginning stage
in the statistical activity. Collecting data
can be performed by interview of
questionnaire,then continued by one of the
following activities ,like
counting,measuring,recording data by tallies.

3. TWO TIPES OF STATISTICA DATA
• QUANTITATIVE data are obtained
from the result of numerical
recording(in the form of figures)
• QUALITATIVE data are data related
to the category of characteristics of
an object.

4. MEASURES OF CENTRAL TENDENCY
• MEAN of data set is the sum of all
data values divided by the number
of data
• MODE is the value that occurs
most frequently
• MEDIAN is a measure of central
tendency used to analize data.

5. We try survey in class VII A
about what they are open, used,
websites on the internet and how
often they are opened internet and
how many times they went to the
Warnet.

7. “HOW OFTEN YOU OPEN INTERNET IN A
DAY?”
DATA TALLY FREQUENCY X.F
1 IIII IIII IIII 15 15
2 IIII 5 10
3 IIII 4 12
5 II 2 10

8. MEAN,MODE,MEDIAN OF THE
FIRST QUESTION
MEAN = SUM OF ALL VALUES
NUMBER OF DATA
= 15+10+12+10
15+5+4+2
= 47
26
= 1.8
MODE = 1
MEDIAN = 26
2
= 13

9. THE RESULT IN PIE CHART
Four times
8%
Three times
15%
Once
Twice
58%
19%

10. “
HOW OFTEN DO YOU USE INTERNET A
DAY ?”
DATA TALLY FREQUENCY F.X
NEVER(1)
IIII IIII 9 9
SELDOM(2)
IIII IIII IIII 15 30
OFTEN(3)
II 2 6

11. MEAN,MODE,MEDIA OF THE SECOND
QUESTION
MEAN = SUM OF ALL VALUES
NUMBER OF DATA
= 9+30+6
9+15+2
= 45
26
= 1.7
MODE = SELDOM (2)
MEDIAN = 22.5 +23.5
2
= 23
=2

12. THE RESULT IN PIE CHART
Sales
Often
11%
Seldom
25%
Never
64%

13. “WHAT YOU USED WHEN YOU OPEN
THE INTERNET”
DATA TALLY FREQUENCY F.X
LAPTOP/COMPUTER
(1)
IIII IIII IIII III 18 18
HANDPHONE(2)
IIII III 8 16

14. MEAN,MODE,MEDIAN,OF THE THIRD
QUESTION
MEAN = SUM OF ALL VALUES
NUMBER OF DATA
= 18+16
18+8
= 34
26
=1.3
MODE = LAPTOP/COMPUTER(1)
MEDIAN = 34
2
= 17
=1

15. THE RESULT IN PIE CHART
Sales
Handphone
31%
Laptop/Comput
er
69%

16. WHAT WEBSITE YOU OFTEN OPEN IF YOU USE
INTERNET?”
DATA TALLY FREQUENCY F.X
FACEBOOK(1) IIII IIII IIII IIII III 23 23
TWITTER(2) IIII IIII II 12 24
YOUTUBE(3) IIII IIII I 11 33
GAME ONLINE(4) IIII IIII IIII II 17 68
FOR IIII IIII 9 45
HOMEWORK(5)
SEARCH IIII IIII III 13 78
INFORMATION(6)
DETIK.COM(7) II 2 14
WIKIPEDIA(8) II 2 16
YAHOO II 2 18

17. MEAN,MODE,MEDIAN OF THE FOURTH
QUESTION
MEAN = SUM OF ALL VALUES
NUMBER OF DATA
=23+24+33+68+45+78+14+16+18
23+12+11+17+9+13+2+2+2
= 319
91
= 3,5
MODE = FACEBOOK (1)
MEDIAN = 159,5+160,5
= 32O
= 320
2
=160
=5

18. THE RESULT IN PIE CHART
Detik.com Wikipedia Yahoo
Search 2% 2% Messenger
Information 2%
15%
Facebook
25%
For Homework
10%
Twitter
Game Online 13%
19% Youtube
12%

19. “DO YOUR PARENTS KNOW IF YOU OFTEN
OPEN INTERNET ?”
DATA TALLY FREQUENCY F.X
KNOW (1)
IIII IIII IIII IIII 25 25
IIII
DIDN’T
KNOW(2) I 1 2

20. MEAN,MODE,MEDIAN OF THE
FIFTH QUESTION
MEAN = SUM OF ALL VALUES
NUMBER OF DATA
= 25+2
26
= 1.04
MODE = KNOW (1)
MEDIAN = 27
2
= 13.5
Median = 1

21. THE RESULT IN PIE CHART
Didn't Know
4%
Know
96%

22. THANKS FOR YOUR
ATTENTION
The Man Who Says He Never Has
Time Is The Laziest Man.
(Lichtenberg)
By learning to obey we know to
command.