# Mathematics

## Pictograph is a graph that uses pictures to represent data. A bar graph is a chart with rectangular bars of lengths proportional to that value that they represent. A double bar graph shows two sets of data simultaneously. It is used for the comparison of the data. The graphical representation of a grouped data is done with the help of histogram. A pie chart is a circular chart divided into sectors, illustrating frequencies or percents. The size of each sector is proportional to the information it represents. It is the number of times a certain value or class of value appears. The organisation of raw data in table form with classes (or individual entries) and a frequency is called a frequency distribution. A random experiment is one whose outcome cannot be predicted exactly in advance. An outcome is the result of a single trial of an experiment. Each outcome of an experiment or a collection of outcomes make an event. Probability is the measure of how likely an event is to happen. Collection of information in raw form in order to reveal useful results is called data. Data can be a number, word or symbol. The number of measurements in an interval is called the frequency corresponding to that interval. Histogram is a graphical representation of grouped frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies.

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