ORGANISING THE DATA. What is data ?. Data is a collection of facts , such as values or Measurements. It can be numbers, words , measurements, observations or even just description of things. why do we organize data?.
“a picture is worth a thousand words”
The advantages of organizing data is that, we
get an overall view of the result of our data and through this , one can easily interpret the data and can make decisions or policies.
Aman weighs 78 kg, is 172cm tall and has scored 91% marks, Rupal has scored 92% , is 153 cm tall and weighs 54 kg ; Yashika- height 146cm , scored 86 % , weight 43kg,……….
Example : We have a frequency distribution which consists of the blood groups of 50 people , which is given below:
What happens , if the data is quite large ? of the blood groups of 50 people , which is given below:
Basic terms used in continuous frequency distribution of the blood groups of 50 people , which is given below:
How to make class intervals of the blood groups of 50 people , which is given below:
Step 1 : Find the minimum and the maximum values in the data .
Step 2 : Find the range = Maximum value – Minimum value.
Step 3 : Decide upon the class size h , of each class interval.
Usually , class size is multiple of 5. Otherwise it can be
any positive number. It depends on the nature and size of
Step 4: Find the number of class intervals by using the formula,
Number of class intervals = least positive integer ≥
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