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Standard deviation is square root of variance { Variance = (SD)2 }. Mean is the average of the given range, with the help of standard deviation and variance we can measure till how far the data spread. Standard deviation measures the dispersion of the observations in a given set whereas variance defines the variability of the observed observation .
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Standard deviation is square root of variance { Variance = (SD)2 }. Mean is the average of the given range, with the help of standard deviation and variance we can measure till how far the data spread. Standard deviation measures the dispersion of the observations in a given set whereas variance defines the variability of the observed observation .
Note: The next question provided by you is incomplete . kindly provide the whole question in separate thread.
Regards