22
Ways of presenting data
Textbook: Part 1, lesson 22, pp. 69–71
GoalKnow ways of presenting data with tables, charts and diagrams.
New words
chart · diagrammasurvey · so‘rovnomadiagram (scheme) · sxemabar (column) · ustun
Explanation
Data can be given as a list, a table, a chart, a picture or a diagram. A table makes exact values easy to find. In a chart we quickly compare values by the height of the bars. We choose the method that suits the purpose. In a survey we ask, count the answers and write them in a table.
Worked examples
20 children named a favourite fruit: apple 8, grape 6, pear 4, apricot 2. Altogether 8 + 6 + 4 + 2 = 20 children.
A chart shows class 4A collected 40 kg of waste paper, 4B 25 kg and 4D 55 kg. The tallest bar is 4D's; it collected 55 − 25 = 30 kg more than 4B.
Class activity
“Mini survey”: the class asks about favourite subject or colour and shows the results in a table and a bar chart in their notebooks.
Practice
1
In a favourite-fruit survey 8 chose apples, 6 grapes, 4 pears and 2 apricots. How many children were asked?
20
2
A chart shows class 4B collected 25 kg of waste paper and 4D 55 kg. How many kg more did 4D collect?
30
3
Three classes collected 40 kg, 25 kg and 55 kg. How many kg did they collect together?
120
4
Which is quicker for comparing data: a table or a bar chart?
A bar chart: the heights of the bars can be compared at a glance