Data Handling

Simple Terms

• MEAN OR AVERAGE

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

• RANGERANGE=HIGHEST OBSERVATION-LOWEST OBSERVATION

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

Uses of data handlingUse 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

PictographsBar graphsTally marks

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 pictographPictograph should not be used in formal usesYou should ensure that you have mentioned

scalePictures in the pictographs should be equal

and simple to draw & resemble

Pictures are equal and easy to draw & resemble

Key or scale should be given

It is easy to answer the questions

A pictograph

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

A bar graph

Scale should be given

Bars are of equal width

Tally marksTally 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 

Tally marks

Thank you

Made by-Shrey ChhabraClass-VII-C