It is quite similar to hair stroke cosmetic tattoo using the machine method, however the strokes are finer, and are not implanted as deeply in the skin. Therefore, cosmetic tattoo brows completed using microblade or microstroke technique are not as permanent.
The mean and standard deviation of a discrete population probability distribution are found by using these formulas: Mean Î¼ = Î£xP(x). Standard Deviation Ï = âÏ(x â Î¼)2P(x). To calculate these figures, we should construct a table which looks like the following: x P(x) xP(x) x - Î¼ (x â Î¼)2 (x â Î¼)2 P(x).
1 The standard deviation of the sampling distribution is the average deviation between the k sample proportions and the true population proportion, P. The standard deviation of the sample proportion Ï p is: 2  where P is the population proportion, n is the sample size, and N is the population size.