In: Statistics and Probability
Calculate the standard deviation for the following data: 13, 7, 7, 7, 7, 6, 6, 5, 5, 4, 4, 3
Solution :-

n = 12
Mean = 
 x / n
Mean = 74 / 12
Mean = 6.167
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Standard Deviation for Sample data is,
S = 
( x - 
 ) ^ 2 / ( n - 1 )
S = 
( 71.667 / 12 - 1 )
s = 
6.515
S = 2.55