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How do you find the standard deviation between 18 22 22 24 33 36?
Wiki User
∙ 13y ago
(1) Find the average of data points: (18+22+22+24+33+36)/6 = 25.83
(2) Next you need to calculate the sample variance subtract the average from each data point then square it, find the total & divide by 1 less the number of data points:
(18 - 25.83)2 = 61.309
(22 - 25.83)2 = 14.669
(22 - 25.83)2 = 14.669
(24 - 25.83)2 = 3.349
(33 - 25.83)2 = 51.409
(36 - 25.83)2 = 103.429
Var. = (61.309+14.669+14.669+3.349+51.409+103.429)/5 = 49.767
(3) The standard deviation is the positive square root of the sample variance:
STD = SQROOT (49.767) = 7.05
Wiki User
∙ 13y ago
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