__CHAPTER 5 DATA HANDLING__DATA

Information collected in the context of a situation to be studied is called data.

GRAPHICAL REPRESENTATION OF DATA

1.

__Pictograph__: Pictorial representation of data using symbols.

2.

__Bar Graph__: Representation of data using bars of uniform width, their heights being proportional to the respective values.

3.

__Double Bar Graph__: A bar graph that shows two sets of data simultaneously is called a double bar graph. This graph is used for comparison of data.

RAW DATA

Data that is in an unorganized form is called raw data. Raw data should be organized in order to gain any inference from it.

FREQUENCY

Frequency gives the number of times a particular entry occurs.

HISTOGRAM

Histogram is a type of bar diagram where the class intervals are shown on the horizontal axis and the heights of the bars show the frequency of the class interval.

There is no gap between the bars as there is no gap between the class intervals.

PIE CHART

A circle graph shows the relationship between a whole and its part.

PROBABILITY

A

**random experiment**is the one whose outcomes cannot be predicted exactly in advance.

Probability of an event= (Number of outcomes that make the event)/(Total number of outcomes of the experiment)

An event is one or more outcomes of an experiment.