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.
Level of difficulty: 4/10 (or 3/10 if you have a friend on-hand to help apply to the back of your head) Courtesy Dianna Pearl. Iâd heard about using Kool-Aid as a hair dye, but Iâd assumed it was just an urban legend, or that if it did work, the color wouldnât show up on my dark brown hair.