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.
The condition of the hair, the color takes better and you use less color because you donât have to run through ends every time. I use Redkin shades color and my color faded within 3 weeks. now I use sulfate free shampoo and cond and it last 6 to 8 weeks. and its thew gray that fades not the ends. Hi Pam.