Answer :
By using the degree of freedom of chi square distribution, standard deviation is 7.0711
What is standard deviation?
At first it is important to know about variance.
Suppose there is a data set
Variance of the data set is the sum of the square of difference of every number of the data from the mean.
On taking the square root of variance, we get standard deviation.
Degree of freedom of chi square distribution is 25
Standard deviation = [tex]\sqrt{2 \times 25}[/tex] = [tex]\sqrt{50} = 7.0711[/tex]
To learn more about standard deviation, refer to the link
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