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.
How Long Does Ketchup Last? Ketchup - How long does ketchup last? Unopened ketchup can last 1-2 years beyond a date stamp if taken care of properly, but there are always certain things to look out for in deciding if your ketchup has gone bad. The shelf life of ketchup, regardless of such things as the best by date or use by date, is very long due to the acidic conditions of ketchup.