In Statistics , Standard Deviation or S.D. is a measure of the dispersion of a data set. A lower SD indicates that the data points are very close to the mean value and higher SD indicates that the data are spread from the mean value.
The term Standard deviation was coined by Karl Pearson in 1894.
How to calculate the Standard Deviation ?
I- Calculate the mean of the data.
II- Now find out the difference of each data point from the mean.
III- Square all the differences.
IV- Add up all these data and take the square root.
V- You get your standard deviation .
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