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In the same way that you calculate mean and median that are greater than the standard deviation!
Square the standard deviation and you will have the variance.
standard actual n.o of men employed 100 90 output in units 5000 4800 no. of working days in a month 20 18 avg.wages per men per month rs.200 rs.198
Standard deviation = square root of variance.
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.