What is microblading or microstroking? How is microblade different to hair stroke cosmetic tattoo? Microblading, also known as microstroking, is an advanced brow embroidery technique whereby a superfine row of needles is used to create thin, hair like marks on the skin, which last up to 18 months.
Find the standard deviation of 4, 9, 11, 12, 17, 5, 8, 12, 14. First work out the mean: 10.222. Now, subtract the mean individually from each of the numbers given and square the result. This is equivalent to the (x - )Â² step. x refers to the values given in the question.
Calculate the Sample Standard Deviation. 1  Calculate the mean or average of each data set. To do this, add up all the numbers in a data set and divide by the total number of pieces of data. For example, if you have found numbers in a data set, divide the sum by 4. This is the mean of the data set.