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Patients’ average years of education was 190 (10 10, 18, 16. 0, 16,,9, 14, 12, 10,...

Patients’ average years of education was 190 (10 10, 18, 16. 0, 16,,9, 14, 12, 10, 14, 18, 17, 13, 13), with a standard deviation of 44.56, and ranged from 0 to 18. Need how to get SD and to show formula.

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The standard deviation is basically

= sqrt ( (X1-mu)^2 + .. + (Xn-mu)^2 / (n-1))

where, mu = average of all values = 13.57143, X1 = 10..Xn = 13

= 2.99319

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