This below code is for calculate standard buy clomid and pay with pay pal. deviation in Ruby on Rails. Here the data set is given in a array. To know more about standard deviation calculations @ [Standard Deviation Calculator](http://ncalculators.com/statistics/mean-standard-deviation-calculator.htm “Standard Deviation Calculator”)

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Steps for Standard Deviation

Step 1 : Use formula for standard deviation,

σ = √[(1/N)Σi(xi-μ)2].

Step 2 : Where σ – the standard deviation

N – number of data points ;

xi – the random variable where i takes values from 1 to N ;

Step 3 : μ- the mean of the data set;

Then write the final answer for σ .

if you any large problem then i will suggest to use Standard Deviation Calculator Online