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Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.
mathsStatistics and ProbabilityStatistics : Fundamentals of Data

### Bar-graph representation

With simple examples, the bar-graph representation of Data is explained.

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In the earlier lessons, Data representation using tally marks, table, and pictograph were explained. These representations were useful to understand details like which data-value is large, which data-values are comparable , etc.

The data can be given in a spatially laid out visual form. It is widely used in newspapers and other publications. Consider the data: Number of students who took a given fruit.

orange 2
apple 2
mango 5
banana 1

The figure depicts a "bargraph" of the data.

The word "bar-graph" means: data represented with bars. The representation can be with horizontal or vertical bars.

familiarize with the terminology
bar-graph

Earlier, we learned about scaling in pictographs. Scaling was introduced to represent large data-values.

The bar graphs have a similar problem. The numbers marked in vertical axis will be too close for large values.

Let us consider the data:

Orange : 15
Apple : 10
Mango : 30
Banana : 5 Instead of marking each of the values in the vertical axis, the values are marked in increment of 5. This is illustrated in the figure.

Let us consider the data:

Orange : 15
Apple : 12
Mango : 28
Banana : 5 The number of apples 12 is represented with a vertical bar of height 12.

Similarly the number of mangoes 28 is represented with a vertical bar of height 28.

Bar-Graph : A spatial representation of data with bars in vertical and horizontal axis.

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