Normal Distribution and z-scores. mean: the average obtained by dividing the sum of the data by the number of data in the set. Given a set of data, {x 1, x 2, x 3, ..., x n }, you can find the mean, , using the following formula: standard deviation: the extent to which data differs from the mean.
Quick Answer. Kool-Aid hair dye hair dye can last for eight to 12 weeks. The intensity of the color depends on several factors such as the natural hair color, the amount of time the hair is soaked with the dye, the amount of dye used and the dyeing method used. Continue Reading.
âYou feel vulnerable,â said Ms. Kreek, who met Ms. Dorram at John Frieda, when she returned to blond after her first round of chemotherapy in 2003. Now, for many women who have lost hair during cancer treatments, dyeing is empowering â and doing it in an open, chatty session makes it all the better. âTheyâre feeling good again,â said Alexis Antonellis, a colorist at Oscar Blandi who often sees clients who want hair colored after chemotherapy. âThey want to go back to who they were.