Overview :

Mean / Median /Mode/ Variance /Standard Deviation are all very basic but very important concept of statistics used in data science. Almost all the machine learning algorithm uses these concepts in data preprocessing steps. These concepts are part of descriptive statistics where we basically used to describe and understand the data for features in Machine learning

Mean :

Mean is also known as average of all the numbers in the data set which is calculated by below equation.

Lets say we have below heights of persons.

heights=[168,170,150,160,182,140,175,191,152,150]

Median :

Median is mid value in this ordered data set.

Arrange the data in the increasing order and then find the mid value.

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