Find the standard deviation for the given sample data 226 16
Find the standard deviation for the given sample data.
22.6 16.1 36.1 36.0 23.8 20.3
Solution
Getting the mean, X,
X = Sum(x) / n
Summing the items, Sum(x) = 154.9
As n = 6
Thus,
X = 25.81666667
Setting up tables,
x x - X (x - X)^2
22.6 -3.216666667 10.34694444
16.1 -9.716666667 94.41361111
36.1 10.28333333 105.7469444
36 10.18333333 103.7002778
23.8 -2.016666667 4.066944444
20.3 -5.516666667 30.43361111
Thus, Sum(x - X)^2 = 348.7083333
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 6
s^2 = 69.74166667
Thus,
s = 8.351147626 [ANSWER]
