Correct Answer - Option 4 : Standard deviation
Mean is the arithmetic average of a data set. This is found by adding the numbers in a data set and dividing by the number of observations in the data set.
The median is the middle number in a data set when the numbers are listed in either ascending or descending order.
MODE is the value of the observation which has the maximum frequency.
The Standard deviation is a measure of dispersion. It is the action or process of distributing thing over a wide area (nothing about central location)
∴ The Standard deviation is not a measure of central tendency.