### Mathematics Class X

Real Numbers
Polynomials
Arithmetic Progressions
Triangles
Coordinate Geometry
Introduction to Trigonometry
Circles
Constructions
Areas Related to Circles
Surface Areas and Volumes
Statistics
Probability

# Frequency

Frequency is the number of times a particular observation occurs in data.

Class Interval

Data can be grouped into class intervals such that all observations in that range belong to that class.

Central tendencies

Mean

It is the average of “n” numbers, which is calculated by dividing the sum of all the numbers by n.

The mean of n values is given by

Median

If we arrange the numbers in an ascending or descending order then the middle number of the series will be median. If the number of series is even then the median will be the average of two middle numbers.

If n is odd then the median is observation.

If the n is even then the median is the average of and observation.

Mode

The number which appears most frequently in the series then it is said to be the mode of n numbers.

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