SOLUTION :
The correct option is (d) : STANDARD DEVIATION
Standard deviation is not a measure of Central tendency.
Mean, Median and Mode are the measure of Central tendency.
★★ MEAN is a set of observations obtained by dividing the sum of the values of all observation by the total number of observations
★★ MODE is the value of the observation which has the maximum frequency .
★★ MEDIAN : After arranging the given data in ascending or descending order of magnitude, the value of the middle most observation is called the median of the data .
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