How to Find Standard Deviation?

To find standard deviation it is the square root of the "Variance". Just simply we can calculate the deviation consider the numbers 1,3,4 6, 9,19 , then find the Mean (1+3+4+6+9+19) / 6 = 7 then find the deviations which is to subtract the mean from the numbers listed so it is -6,-4,-3,-1,2,12 then square the deviations which is 36,16,9,1,4,144 the add the deviations squared then divide by number one less than the count of numbers so it is 210/5 = 42 , square root of 42 is approx 6.48 which is the standard deviation.

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