1. Data Handling

2. Simple Terms MEAN OR AVERAGE MEAN=SUM OF OBSERVATIONS NO. OF OBSERVATIONS A CRICKETER SCORED FOLLOWING RUNS IN 5 INNINGS.WHAT IS HIS AVERAGE? 63,12,0,39,106 MEAN=63+12+0+39+106 5 MEAN=220 5 MEAN= 44 RUNS

3. RANGE RANGE=HIGHEST OBSERVATION-LOWEST OBSERVATION A CRICKETER SCORED FOLLOWING RUNS IN 5 INNINGS.WHAT IS RANGEOF THE DATA? 63,12,0,39,106 RANGE= 106-0 = 106

4. Uses of data handling Use of pictorial graphs makes the concept more clear and help us to understand the thing easily as compared to written text. 3 types of pictorial graphs used in data handling  Pictographs  Bar graphs  Tally marks

5. Pictographs A pictograph is a graph that shows numerical information by using picture symbols or icons to represent data sets. The advantage of using a pictograph is that it is easy to read. Points to be noted while making a pictograph  Pictograph should not be used in formal uses  You should ensure that you have mentioned scale  Pictures in the pictographs should be equal and simple to draw & resemble

6. Pictures are equal and easy to draw & resemble Key or scale should be given It is easy to answer the questions A pictograph

7. Bar graphs Bar graph is a diagram in which the numerical values of variables are represented by the height or length of lines or rectangles of equal width. Points to be noted while making a pictograph  The bars should be of equal width.  The scale should be given

8. A bar graph Scale should be given Bars are of equal width

9. Tally marks Tally marks, or hash marks, are a unary numeral system. They are a form of numeral used for counting. They allow updating written intermediate results without erasing or discarding anything written down. Tally marks used in most Tally marks used in china,japan,korea and taiwan Tally marks used in france, spain, South America

10. Tally marks