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.
Need some advice re. hairdye! currently use clairol nice and easy- 116 or 116a (tend to use the more gold one in summer) but I find it really fades and my grey shows up after 2 weeks or so. Pre having children I used to get it professionally done and I think- but am not sure- that my colour was majirel 5.3.