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.
We Tried It: Dyeing Our Hair with Kool-Aid. Why she did it: Iâm not sure what it is about the warmer months that moves me to do strange things to my hair, but I just canât help it. Two summers ago â in a woefully unsuccessful attempt to emulate Rihanna â I got an undercut, but this year, I wanted to freshen up my look with some funky color.